Heathrow is being hit with huge immigration queues again as passengers report delays of nearly two and a half hours.
Airport operator BAAadmitted that target times for passengers passing through immigration were missed, reports the Telegraph.
Union officials warned of chaos as an extra 650,000 passengers are expected to pass though the airport during the Olympic Games.
On Friday passengers at Terminal 4 were stuck in half-mile queues and claimed two out of three desks were not manned at immigration.
BAA target times are 45 mins for non-EU passengers and 25 mins for those with UK and EU passports.
The company said that over a two-hour period on Friday morning queue times were on average 1hr 30 mins. There were similar problems later that day and also during busier periods on Saturday.
From July 15, an extra 72 immigration workers will be available, which should boost numbers from 453 to 535.
