Sabena airliners which were augmented and later replaced by Douglas DC-6Bs. The DC-4s also restarted the airline's traditional route to the Belgian Congo. Sabena was the first airline to introduce transatlantic schedules from the north of England, when one of its DC-6Bs inaugurated the Brussels-Manchester-New York route on 28 October 1953. The Convair 240 was introduced in 1949 to partially replace the DC-3s that until then had flown most European services. As of 1956, improved Convair 440 "Metropolitan" twins began replacing the Convair 240 twins and were used successfully well into the 1960s between European regional destinations. In 1957, the long-range
National Airlines (1999–2002) Like many other airlines, National had serious financial problems after the September 11 attacks in 2001, and only 41 months after their inaugural flight left Las Vegas' McCarran International Airport, the airline ceased all operations on November 6, 2002 after being in Chapter 11 bankruptcy for 23 months. As of the day of National's grounding on November 6, 2002, the airline had carried 1.85 million passengers through McCarran (January - November, 2002), and National was the airport's fourth-largest carrier based upon passenger volume. Departing McCarran International Airport at 4:20 p.m., National Airlines Flight 354 to Dallas/Fort Worth was the carrier's