11.   Some business travelers, impressed by lower fares and fewer delays out of less congested secondary or tertiary airports, have begun flying these airlines, too.

12.   This is one of several changes Delta is making, notably creating a requirement for flying the airline regularly to keep the mileage accumulation valid.

13.   According to the White House, she is not flying commercial airlines because military planes provide better security.

14.   For destinations in Europe and the United States, for example, more and more travelers are choosing to fly other airlines.

15.   Since Saturday, many travelers have canceled plans to fly the airline.

16.   Vowing not to fly the airline in the future, she changed her flight to avoid more problems.