Travel expert Simon Calder has told London Tonight that the queues at Heathrow have been caused by border officials being forced to carry out rigorous checks, regardless of the risk profile of the passengers that are arriving.
He said that they were effectively "working to rule" even though "they know from years of experience that actually the vast majority of passengers coming in through Terminal 5 are no threat whatsoever and they would rather be focusing on the flights they believe are of particular interest."
He added: "To be stuck in a queue for two, three, maybe four hours, as we saw some poor passengers on Friday night, is really not good enough.
"There are various solutions that could be proposed to this - including throwing more money at it or training more people - but in the short term the only thing to do is to let people through more quickly on certain flights."
Lengthy queues at Heathrow cleared overnight - but further concerns were raised today about the reputation of the airport with the Olympics on the horizon.
Keith Vaz, chairman of the Home Affairs Select Committee, told BBC Radio 4's Today programme: "There is a real problem and the problem has emerged over the last few months.
"I'm not saying we should abandon checks, but it's a choice for the Government - you either look at the way you deal with people when they arrive at Heathrow or you recruit more staff.
"This is not just about the Olympics, this is about what happens before and after, it's about Heathrow as a world-class airport and it's about our reputation, and we need to make sure we get it sorted."