1.   A source close to the investigation said the airlines were prohibited from disclosing the origin and destination airports of the diverted flights until all of them are completed.

2.   Consider, too, the destination airport.

3.   La Guardia is what is known as an origin and destination airport, one that passengers tend to pass through as quickly as possible.

4.   One-way rentals are available if the destination airport has an InMotion kiosk.

5.   Some started the clock when a passenger filed a missing bag claim, while others started it only when the bag finally arrived at the destination airport.

6.   The system asks for the flight number, the airline and the destination airport.

7.   They are given customs paperwork for the parcel, which they must hand off to a freight company representative at the destination airport, both coming and going.

8.   Other planes could leave as soon as their destination airports had finished improving security procedures.

9.   The most popular destination airports were Paris, Dublin, London and Madrid, according to the study.