Illustrative image; it may differ from the actual aircraft.

Embraer ERJ 145 (EMB-145XR)

ERJ145-145703Active

RegistrationUSN21129

Verified aircraft dataagainst the official civil aviation register

OperatorUnited Airlines

1operators

3incidents

0accidents

11logbook years

0photos

Embraer ERJ 145 (EMB-145XR) built in 2003 in São José dos Campos. Operates for United Airlines.

NewNearly newYoungMatureAgingOld

Aging · 23 years · ≈ 46,000 flight hours (approx.)

Vuelopedia is a work in progress: it currently holds about 30% of the information we expect to have by the third quarter of 2027. Although we use only official, highly reliable sources, some aircraft data and history may still contain errors or inaccuracies. We work hard to clear every anomaly from the records using specialized verification tools.

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Technical data

ManufacturerEmbraer

Engines2× ROLLS-ROYC AE3007 SER

PropulsionJet

First flight2003

Built inSão José dos Campos, Brasil

Country of registrationEstados Unidos

OwnerUnited Airlines Inc

MSN145703

Hex / ICAO 24-bitA1BFF9

VerificationIdentity verified against the official register of FAA (United States) · Oct 8, 2026

The model · Embraer ERJ 135 / 145

Figures for the ERJ-145 variant, the most representative of the family

Length29.9 m98 ft

Wingspan20.0 m66 ft

Height6.8 m22 ft

Range2,871 km1,550 NMWith a typical passenger load

Cruise speed828 km/h447 ktMach 0.78

Service ceiling11,280 m37,008 ftIt flies above Everest (1.3 times its height)

Maximum take-off weight22,000 kg48,502 lb

Maximum payload9,886 kg21,795 lbIts 50 passengers with baggage would weigh about 5.0 t; the rest is fuel and cargo

Typical capacity50 passengers

Endurance3 h 28 minAt cruise speed, non-stop

With its 2,871 km range, from Houston it could fly non-stop as far as:

PTYTocumen2,856 km JFKNew York2,278 km LAXLos Angeles2,215 km YYZToronto2,060 km MIAMiami1,549 km

Beyond its rangeSEASeattle3,013 km

The type first flew in 1995 (31 years ago) · About 1,230 units built · Production ended in 2020

Figures for the type, not for this particular aircraft: each variant and each configuration changes something. They are shown in both systems used in aviation.

The full story of the Embraer ERJ 135 / 145 Compare this aircraft

Airports

Where this aircraft has operated, by period · source BTS (EE. UU.)

2019–2026United Airlines network of its de jet regional aircraft

Base

IAHHouston ORDChicago DENDenver

Main destinations

IADDulles EWRNewark LAXLos Angeles CLECleveland SFOSan Francisco YYZToronto ATLAtlanta STLSt Louis YULMontréal

Flight logbook

Year-by-year activity · source BTS (EE. UU.)

2016

ExpressJet · 835 flights during the year · base Houston (IAH)

Main route of the year: Houston (IAH) → Jackson/Vicksburg (JAN)

2015

ExpressJet · 1,412 flights during the year · base Houston (IAH)

Main route of the year: Houston (IAH) → Tulsa (TUL)

2014

ExpressJet · 1,483 flights during the year · base Houston (IAH)

Main route of the year: Denver (DEN) → Williston (ISN)

2013

ExpressJet · 1,315 flights during the year · base Houston (IAH)

Main route of the year: Newark (EWR) → Kansas City (MCI)

2012

ExpressJet · 1,650 flights during the year · base Houston (IAH)

Main route of the year: Kansas City (MCI) → Newark (EWR)

2011

ExpressJet Airlines · 1,437 flights during the year · base Houston (IAH)

Main route of the year: Minneapolis (MSP) → Newark (EWR)

2010

ExpressJet Airlines · 1,264 flights during the year · base Houston (IAH)

Main route of the year: Minneapolis (MSP) → Newark (EWR)

2009

ExpressJet Airlines · 1,064 flights during the year · base Houston (IAH)

Main route of the year: Newark (EWR) → Kansas City (MCI)

No reliable logbook records exist for this aircraft before 2006.

Aircraft chronology

2003

Built

Assembled by Embraer in São José dos Campos, Brazil.

Jul 31, 2015

Incident at Portland

On July 31, 2015, the Embraer EMB-145XR aircraft (registration N21129), was involved in an incident at Portland.

Aug 27, 2019

Delivered to United Airlines

Delivered to United Airlines as N21129.

Sep 24, 2025

Incident at Roanoke, Virginia

On September 24, 2025, the Embraer Emb-145Xr aircraft (registration N21129), operated by United Airlines, was involved in an incident at Roanoke, Virginia (United States). Source: the NTSB (United States).

What happened

On 24 September 2025, at 21:17 Eastern Daylight Time, CommuteAir flight 4339 (operating as United Express), an Embraer EMB-145XR registered N21129 arriving from Washington Dulles International Airport (IAD) under Part 121, ran off the runway while landing at Roanoke-Blacksburg Regional Airport (ROA), Virginia: it overran the end of runway 34 and stopped in the engineered materials arresting system (EMAS), with no injuries among the 3 crew and 50 passengers and no damage to the aircraft. The aircraft had had to be deplaned twice for maintenance issues and left more than two hours late. En route, the crew reviewed the storms approaching ROA; the ATIS reported calm wind, no precipitation and runway 6 in use, but approach control reported rain on the path to 6 and traffic landing on 34, so the crew switched to the ILS approach to 34. During the manoeuvre the rain intensified. Source: the NTSB (United States).

Source: NTSB

Sep 24, 2025

Incident at Roanoke

On September 24, 2025, the aircraft (registration N21129), operated by Commute, was involved in an incident at Roanoke. Source: the FAA (United States).

Source: FAA

Operators

2019-08-27

United Airlines

Registration N21129 · Lessor: United

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This page was last updated on October 10, 2026

APA

Vuelopedia. (2026, October 10). Embraer ERJ 145 (EMB-145XR) · N21129 · United Airlines. Retrieved October 25, 2026, from https://vuelopedia.org/en/aircraft/ERJ145-145703

MLA

“Embraer ERJ 145 (EMB-145XR) · N21129 · United Airlines.” Vuelopedia, Fundación Poderia, 10 Oct. 2026, vuelopedia.org/en/aircraft/ERJ145-145703. Accessed 25 Oct. 2026.

Chicago

Vuelopedia. “Embraer ERJ 145 (EMB-145XR) · N21129 · United Airlines.” Fundación Poderia. Last modified October 10, 2026. https://vuelopedia.org/en/aircraft/ERJ145-145703.

Harvard

Vuelopedia (2026) Embraer ERJ 145 (EMB-145XR) · N21129 · United Airlines. Available at: https://vuelopedia.org/en/aircraft/ERJ145-145703 (Accessed: 25 October 2026).

BibTeX

@misc{vuelopedia_en_aircraft_erj145_145703,
  author       = {{Vuelopedia}},
  title        = {{Embraer ERJ 145 (EMB-145XR) · N21129 · United Airlines}},
  publisher    = {Fundación Poderia},
  year         = {2026},
  date         = {2026-10-10},
  url          = {https://vuelopedia.org/en/aircraft/ERJ145-145703},
  howpublished = {\url{https://vuelopedia.org/en/aircraft/ERJ145-145703}},
  urldate      = {2026-10-25},
  note         = {Accessed 2026-10-25}
}

Wikipedia

{{cite web |url=https://vuelopedia.org/en/aircraft/ERJ145-145703 |title=Embraer ERJ 145 (EMB-145XR) · N21129 · United Airlines |website=Vuelopedia |publisher=Fundación Poderia |date=2026-10-10 |access-date=2026-10-25 |language=en}}