But delays sometimes make it a longer day. In a recent clarification of its rule, the FAA says it will no longer allow airlines to require pilots to work more than 16 hours. But airlines say the stricter interpretation will play havoc with their schedules, and could cause more delays during the busy travel season this summer. They're suing the FAA to stop a strict 16-hour pilot work day. So in most cases, that flight will be canceled.
Pilots say the problem is particularly acute at regional and cargo airlines.