51.   Smaller regional airlines still try to make flying fun.

52.   So instead of complaining about underlying security issues, many airlines are trying to ease the long lines at security gates.

53.   Similarly, dropping flights can alienate customers, so airlines try to avoid that step.

54.   Some American customers are buying duplicate tickets on other carriers to avoid being stranded if the pilots strike, a practice some airlines are trying to discourage.

55.   Some major airlines also try to protect themselves against fuel increases by hedging their purchases.

56.   Some analysts expected the Delta order to go exclusively to Boeing because airlines are trying to cut costs of maintenance and pilot training by buying planes from one manufacturer.

57.   Some investigators at the safety board say, with annoyance, that the airline has been trying to keep a missile theory alive.

58.   The airlines are trying hard to avoid unnecessary delays, largely to avoid inconveniencing and alienating business travelers.

59.   The agents say the airlines are trying to price them right out of business.

60.   The airline is trying to keep pace with competitors in the region, many of whom have recently made large orders.