Methodology · airlines

IVCA v2.5

The Vuelopedia Air Quality Index (IVCA) is an independent, non-profit ranking. It merges the most reliable sources in the industry into a single score from 0 to 100, with public weights and reproducible rules. This page explains exactly how it is calculated. edition.

The principle: two families of evidence

The key methodological choice is to separate objective, verifiable data from passenger perception, and to give each an explicit weight. No airline rises or falls on a single criterion.

Operations and fleet · objective

32% of the index. Punctuality, wide-body fleet and environmental certification. We calculate these ourselves from verifiable records (official flight data, the fleet each airline publishes, cross-checked against the record of every aircraft, and the industry’s public environmental-assessment register). It is hard data, not opinion.

Perception · awards

48% of the index. Service and product quality as measured by third parties: globally awarded recognitions — an international passenger survey (world and by region), an international on-board experience rating, a star-based product certification and an international product and service assessment — and, since v2.3, the frequent-flyer programme, with its recognition in the international programme listings and industry awards. They are used only as an input to the calculation: we take the placing or category as a fact and convert it into a score band; we never republish their lists, placings or logos, nor do we name their organisers.

Network and track record · scale

20% of the index. The size of the active fleet, the number of destinations, the continents served, the years since foundation and membership of a global alliance (Star Alliance, SkyTeam, oneworld) with founder status. It separates a global airline from an excellent regional one: a network of 300 destinations on six continents is an asset for the passenger that a small operation, however punctual, does not offer.

The indicators and their weight

Three pillars: passenger experience 48%, operations and fleet 32% and network and track record 20% (since v2.2; fourteen indicators and v2.5 rules). The weights are versioned, public parameters.

IndicatorWhat it measures and howSourceNormalisationWeight

Punctuality
our own% of flights on time (arrival within 15 min of schedule). Since v2.3 the Cirium figure prevails, the same metric for every airline; official flight data (BTS) covers the US carriers Cirium does not publish, and the figure an airline declares in its annual report fills the rest. Since v2.4 it is the indicator with the greatest weight in the indexOur own · Cirium 2025, official flight data, annual report55%→0, 90%→100. No data: regional ceiling (one point below the tenth most punctual airline of its region)23%

Wide-body fleet
our ownWide-body (twin-aisle) passenger aircraft in the active fleet — A330, A350, A380, A340, A300, A310, 747, 767, 777, 787… — according to the fleet the airline publishes in its public profile (fleet table, with source and date), cross-checked against Vuelopedia’s aircraft records. Freighters, tankers and VIP aircraft are left out. Long haul and premium cabins are product: the indicator recognises the airlines that offer itOur own · fleet published by the airline, cross-checked against the record of every aircraftNo wide-body→0; 1 aircraft→50, 10→75, 100 or more→100 (log scale)7%

Environmental certification
external registerBeing listed in the air transport industry’s public environmental-assessment register, an independent environmental certification of the airline’s environmental management (read on 7 October 2026)Public environmental-assessment register of the air transport industryCertification in force→100; in progress (registered)→70; not registered→50 (neutral value)2%

Fleet size
our ownAircraft in service according to the fleet the airline publishes, checked against the record of every aircraft; published and scored by bands — 25, 50, 75, 100, 150, 200, 300, 500, 750 and 1,000 aircraft or more — so that a difference of a few aircraft does not move the scoreOur own · fleet published by the airline, checked against the recordBy bands: 25→0, 50→19, 100→38, 200→56, 500→81, 1,000→100 (log scale)3%

Destination network
our ownNumber of destinations published by the airline (Wikipedia profile)Our own · airline profile20→0, 300→100 (log scale)4%

Continents served
our ownSix continents: North America (the United States and Canada), Latin America (Mexico, Central America, the Caribbean and South America), Europe (including Türkiye, European Russia and the Canary Islands, Madeira and the Azores), Asia (including the Middle East, Siberia and the Russian Far East), Africa and Oceania. Scheduled passenger destinations the airline operates today with its own aircraft count, checked against its published network.Our own · network published by the airline (October 2026)20 points per continent; 5 or more→1005%

Track record
our ownYears since foundationOur own · Wikidata5 years→0, 75 years→1004%

Global alliance
our ownMembership of Star Alliance, SkyTeam or oneworld and founder status: reciprocal lounges, status, miles and connections across 15 to 26 partnersOur own · membership verified (October 2026)Founder→100, member→85, no alliance→404%

Global airline recognition
awardInternational passenger satisfaction survey (list of the world’s 100 best)Globally awarded recognition (input)1st→100, last on the list→60; not listed→5015%

Regional recognition (best in its region)
award“Best Airline in” each region of the world in the same international survey (Western Europe, South America, Central America…). It is an honour relative to its region — Central America is not Europe —, hence its small weight since v2.3Globally awarded recognition (input)Winner→100; the rest→503%

On-board experience rating
awardInternational on-board experience rating by more than a million passengers (top tier, five stars, four stars)Globally awarded recognition (input)Top tier→100, five stars→90, four stars→70; not rated→5011%

Product rating (stars)
awardInternational audited product certification: cabins, seats, ground and on-board serviceGlobally awarded recognition (input)5★→100, 4★→80, 3★→60; not rated→504%

International product and service assessment
awardInternational mixed assessment of product and experience (list of the world’s 25 best)Globally awarded recognition (input)1st→100, last on the list→60; not listed→509%

Frequent-flyer programme
awardAssessed for every airline, according to the official programme it offers its passengers: its own, its group’s or the one it adopted as its programme. A programme with accrual of miles redeemable for flights that appears in the international programme listings receives its recognition, the same as in the programme ranking; a shared programme (Flying Blue, Miles & More) scores for all its airlinesInternational programme listings and industry awards (input)Recognition from 50 to 100: placing in the world programme listing (1st→90, last→50) + the year’s industry awards (Programme of the Year +6, each other category +2, maximum +10) + US national listing (1st +5 … 5th +1); maximum 100. A programme with accrual that does not appear in those listings, accrual only in partner airlines’ programmes, or a regional airline flying under another airline’s brand→50 (common baseline). No accrual programme, or only a paid discount club or subscription→06%

No single source weighs more than a quarter of the index: since v2.4 the international passenger survey (global recognition, stars and regional) adds up to 22% rather than the two thirds of the experience pillar it used to before v2.3; the on-board experience rating, the international assessment and the frequent-flyer programme share the rest. Punctuality, at 23%, is the indicator with the greatest weight, and it is our own data. «The best airline» is partly measurable reliability and partly perceived experience.

The calculation, step by step

Normalise each indicator to 0–100

With fixed, published anchors (those in the table), the same in every edition so results can be compared over time.

Score per pillar

Weighted average of all the indicators in the pillar. An indicator with no data is worth 50, the neutral value: it neither rewards nor penalises, and it also lowers confidence. The exception, since v2.3, is punctuality: Cirium only publishes the ten most punctual airlines of each region, so not being listed bounds the figure from above; an airline with no figure receives one percentage point less than the tenth of its region, not 50. (Up to v1.3 the weight of a missing figure was spread over the others, which amplified what was left: for an airline with no punctuality figure, the rest of the pillar weighed twice as much.)

Composite index (IVCA)

Operations and fleet at 32%, experience at 48% and network and track record at 20%. Eligibility: the operations and fleet pillar must have real data and at least two indicators outside the network pillar must be real; otherwise the airline is left as “insufficient data”. The wide-body fleet is real data for every airline with a fleet: operating none is also a figure (it is worth 0).

Confidence factor

How much of the possible information is present. It is published alongside each placing and does not alter the score: an indicator with no data is already worth 50, and shrinking towards the average on top of that was penalising the same gap twice. The lists that assess every airline — the global recognition, the “best in its region”, the on-board experience rating and the international assessment — count as present data even when the airline is not listed: not being listed is information, not absence. In that case the indicator is worth 50 (the neutral value), it is not replaced by any other figure and confidence does not drop; the profile marks it as “not listed in”.

Global and regional ranking

The same score orders the world ranking and, filtered by the airline’s home continent, that of each region.

Live, versioned and reproducible

Quarterly refresh Every quarter the whole index is recalculated with the most recent edition of each award and the newest flight data; the edition label gives quarter and year.

Methodology version The weights and anchors are stored by version (v2.5). Any past ranking can be recomputed identically.

Validity of each source Every figure carries the date or edition of its source (visible in the profile and in the PDF report); each quarterly edition loads the most recent publication of every award and every operational figure.

Traceability Each placing comes with its breakdown by indicator and an explanation of why it ended up where it did.

Artificial-intelligence agents The calculations of each edition and the data-validation processes (aircraft identity, attribution of events, cross-checks against official registers) are carried out with the help of artificial-intelligence agents. The methodology, the weights, the sources and the editorial decisions are Vuelopedia’s; results are reviewed before publication.

Version history · what changed in each one, and why.

v2.5 · October 2026 (Q4 2026 edition) The average fleet age (4%) is withdrawn: it depended on aircraft registers that do not always distinguish the aircraft that no longer fly, and the index keeps to verifiable variables. The 4% that fleet age weighed stays in the operations pillar: punctuality goes from 20 to 23% and the wide-body fleet from 6 to 7%; the pillars do not change (32 / 48 / 20). The frequent-flyer programme (6%) is now assessed for every airline: a programme with mileage accrual that appears in the international listings receives its recognition (from 50 to 100); one that does not appear, accrual only with partner airlines, and the programme of a regional airline flying under another airline’s brand receive the common baseline of 50; no accrual programme, 0. Fleet size is taken from the fleet each airline publishes and scored by bands (25, 50, 75, 100, 150, 200, 300, 500, 750 and 1,000 aircraft or more); continents served are counted on the network the airline flies today, with six continents: North America, Latin America, Europe, Asia, Africa and Oceania. Fourteen indicators.

v2.4 · October 2026 The index no longer includes an operational-safety indicator; safety is a matter for the aviation authorities and the official investigations, and the IVCA concentrates on product, commercial operation and network. Two indicators of our own, both verifiable, come in: wide-body fleet (6%) and environmental certification (2%). Punctuality (16 → 20%), the frequent-flyer programme (4 → 6%), the global alliance (3 → 4%), track record (2 → 4%) and continents served (3 → 5%) go up; fleet size (6 → 3%), destination network (6 → 4%), global recognition (16 → 15%) and the on-board experience rating (12 → 11%) go down. The operation pillar is renamed “Operations and fleet”. Pillars 32 / 48 / 20 unchanged.

v2.3 · October 2026 Regional recognition drops to 3% (it is an honour relative to its region) and the experience sources are spread more evenly. Punctuality with no data receives a regional ceiling instead of the neutral value, and Cirium becomes the main source with the same metric for every airline. The frequent-flyer programme (4%) and the global alliance (3%) come in.

v2.2 · October 2026 Third pillar, network and track record (20%): fleet size, destinations, continents and years since foundation. Operation 32% and experience 48%, keeping their previous proportion.

Sources and fair use

The index cross-checks public information from recognised awards against operational and fleet data of our own making.

Vuelopedia is an independent, non-profit encyclopedia. The recognitions are used only as one ingredient of the calculation: we take an airline’s placing or category as a fact and convert it into a score band. We do not reproduce any award’s tables or placings, we do not use their logos or name their organisers — their results belong to them — and what we publish is solely Vuelopedia’s own score and ordering. Punctuality is taken from the Cirium On-Time Performance Review, which authorises quotation with attribution. Environmental certification is read from the air transport industry’s public environmental-assessment register, and only the fact of being listed or not is used. The objective data is calculated from verifiable sources we can audit.

Coverage and limits

Transparency also means saying what is missing. In this edition:

Airlines considered Only passenger airlines with 25 or more active aircraft are ranked: a relevance threshold that ensures a sample large enough to calculate reliable indicators. The exception is Mexico, Central America and the Caribbean, where — because there are few airlines — the threshold drops to 6 aircraft to give a representative field. Bases or subsidiaries of the same airline count as one. Airlines that have ceased operations and cargo carriers are left out: the index measures the passenger experience.

Active fleet An aircraft counts as active if its status is known and it is not retired. If the status is unknown, it counts unless it is more than 30 years old: that way the historic aircraft still on an airline’s record are not counted as fleet in service.

Regions The ranking is ordered globally and by region. North America groups the United States and Canada; the rest of the continent — Mexico, Central America, the Caribbean and South America — competes in a single region, Latin America. There are six regions, the same six used by the «Continents served» indicator: North America, Latin America, Europe (with Türkiye and Russia), Asia (with the Middle East), Africa and Oceania.

Wide-body fleet: what counts Only wide-body passenger aircraft in the active fleet, according to the fleet the airline publishes in its public profile, cross-checked against Vuelopedia’s records; freighters, tankers and VIP aircraft do not count. Operating none is worth 0 and is a figure, not a gap: a short-haul airline starts there and makes up for it with punctuality and the other indicators. The scale is logarithmic (one aircraft is already worth 50; a hundred, 100), so size does not rule: what counts is having the long-haul product, not how many hundreds of aircraft one owns.

Environmental certification Environmental certification is taken from the air transport industry’s public environmental-assessment register as it stood on 7 October 2026: in force, in progress or not registered; not being listed is worth 50, the neutral value, because not registering is not the same as not managing. It weighs little (2%), and we say so.

Airlines only The airport ranking is under development: there is not yet global operational airport data complete enough for a fair index.

Regional punctuality Since v2.3 the Cirium figure prevails for every airline (same metric: arrivals within 15 minutes); official US flight data covers the carriers Cirium does not publish, and the number each airline declares in its annual report fills the rest, with its definition. Cirium only publishes the ten most punctual airlines of each region: an airline not listed sits one percentage point below the tenth of its region (it is not among the ten, so it does not beat it) and with lower confidence. It is the index’s biggest gap, and it is stated here.

Experience and product The experience pillar (48%) combines two passenger-voted recognitions (the global one, with its world top 100 and “best in its region”, and an international assessment of the 25 best), two product ratings (the on-board experience, with more than a million flights rated, and the certified stars) and the frequent-flyer programme. So a network airline with first-class cabins and service scores for what it offers, and a punctual airline scores for what it delivers in the operations and fleet pillar (32%). An airline that appears on no list receives 50 — the neutral value; it is neither rewarded nor penalised for not having been assessed. In the frequent-flyer programme the common baseline is also 50, and it is worth 0 only when the airline offers no mileage-accrual programme.

See the ranking Airport methodology

No assessment of this kind is entirely objective. IVCA results should be read as a methodological approximation for identifying the best performance of airlines, airports, alliances and frequent-flyer programmes, not as an absolute or unchangeable truth. They are also a snapshot in time: the index is recalculated every quarter and changes with events and with the data available.

An independent Vuelopedia index. Not affiliated with or endorsed by any airline, alliance, programme, airport or organiser of awards or surveys; third-party recognitions are used only as an input and are not republished.