Historically, Shreveport was served by a number of airlines operating mainline jet service. Delta Air Lines was a major player at the airport for many years as Shreveport was a "focus city" and mini-hub for this air carrier. According to the February 1, 1976, edition of the Official Airline Guide (OAG), Delta was operating thirty-three (33) flights a day with Boeing 727-200 and McDonnell Douglas DC-9-30 jetliners from Shreveport. The December 15, 1979, Delta timetable lists ten (10) daily direct, no change of plane and nonstop jet services to Atlanta as well as daily nonstop jet flights to Dallas/Fort Worth, Houston, Little Rock, Birmingham, AL, Jackson, MS, Memphis, New Orleans, and Baton Rouge. This Delta timetable also lists one-stop, no change of plane direct jet service from Shreveport to New York–La Guardia Airport, Los Angeles, San Francisco, National (now known as Reagan National) Airport in Washington, D.C., Phoenix, Denver, Chicago, and St. Louis. Delta later operated Boeing 737 and McDonnell Douglas MD-80 jetliners from the airport as well. Northwest Airlines flew Douglas DC-9 jets nonstop to Memphis. Trans World Airlines (TWA) served the airport as well with Douglas DC-9 jet service to St. Louis. Other airlines that previously served Shreveport included the original Braniff International flying British Aircraft Corporation BAC One-Eleven jets followed by Boeing 727-200 jetliners nonstop to New Orleans and Fort Smith, AR, and also direct to Kansas City, Tulsa, Chicago and Minneapolis/St Paul. The original Frontier Airlines (1950-1986) also served Shreveport and operated Boeing 737-200 jetliners nonstop to Dallas/Fort Worth with direct, one-stop service to Denver. In the late 1970s Texas International Airlines serviced Shreveport with daily flights between Dallas and Texarkana using Convair 600 aircraft. In later years, American Airlines flew Boeing 727-200 and McDonnell Douglas MD-80 jet service nonstop to Dallas/Fort Worth while Continental Airlines operated Douglas DC-9 jets on nonstop flights to Houston. Now defunct Royale Airlines, a regional airline, was based at the Shreveport Regional Airport from 1962 until 1989. It served 23 cities in Louisiana, Texas, Mississippi and Florida using Embraer EMB-110 Bandeirante, Beechcraft Model 99, Short 330, Grumman Gulfstream I and de Havilland Canada DHC-6 Twin Otter turboprops as well as Douglas DC-9-10 jetliners.