Airlines using two Heathrow terminals are having to trim schedules today after a baggage handling failure on Friday.
The system at Terminal 2 failed, leading to a build-up of bags outside the building.
Hundreds of pieces of luggage were finally sorted out on Sunday evening, with a team of workers loading the bags into vehicles.
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Many arriving passengers faced long waits for their baggage after landing on long-haul flights.
A Heathrow spokesperson said: “We apologise unreservedly for the disruption passengers have faced over the course of this weekend.
“The technical issues affecting baggage systems have led to us making the decision to request airlines operating in Terminals 2 and 3 to consolidate their schedules on Monday 20 June.
“This will enable us to minimise ongoing impact and we ask that all passengers check with their airlines for the latest information.”
About 90 flights affecting an estimated 15,000 passengers are expected to be affected, according to The Independent.