Information boards showed that most flights would leave on time, but the lines at ticketing counters signaled that many travelers were in for more delays.

London's Heathrow Airport resumed full operations on Saturday, a day after a fire knocked out its power supply and shut Europe's busiest air hub, but airlines warned of delays and cancellations as schedules are fixed and affected passengers are rerouted.

The airport's chief executive has told the BBC he's proud of how it dealt with the chaos.