British Airways has cancelled more than 120 flights after snow added to the list of woes at Heathrow's Terminal 5.
With 12 flights scrapped from the schedule because of ongoing problems with the automated baggage system, another 126 were axed because of the cold weather.
Baggage handlers at the £4.3 billion building are continuing to sort passengers' luggage by hand as airport operator BAA attempts to rectify a software glitch which first occurred on Saturday morning.
The technical problem affects the baggage reconciliation system, which ensures passengers' bags are only loaded on to planes which they are travelling on.
BAA said engineers worked through the night to minimise disruption to passengers and flights.
Saturday was meant to have been the day BA returned to normal operations at Terminal 5 following its shambolic opening more than a week ago.
The lower frequency weekend schedule was supposed to give the airport operators some leeway in preparing to run a full weekday service for the first time.
The problems over the last few days are estimated to have cost BA up to £16 million.
