21.   United is not the first airline to use self-service kiosks.

22.   USAir is also among the first airlines to use flexible seating to expand or contract a class of service to meet the demand on each flight.

23.   Valujet and Southwest were among the first airlines to use ticketless travel.

24.   Virgin was the first airline to carry defibrillators in the event of a heart attack onboard.

25.   United is not the first U.S. airline to end unprofitable flights this year.

26.   United was also the first airline to sign a new, more generous labor agreement with its pilots last summer.

27.   While several airlines used Enigma products because suppliers such as engine manufacturers use them, Delta is the first airline to purchase the software, called Xtend.

28.   Air Lib became the first French airline to serve the North African country since Air France and most international carriers halted services after a deadly hijacking seven years ago.

29.   Air Lib becomes the first French airline to serve the North African country since Air France and most international carriers halted services after a deadly hijacking seven years ago.

30.   British Airways said it is the first airline to offer such a service.