Some believe today's report did not draw firm conclusions in order to avoid a politically divisive issue before the next election.
Expansion of Heathrow and Gatwick Airports are the shortlisted options being considered by a government report into airport expansion.
Heathrow is the third busiest airport in the world in terms of passenger numbers. It carried more than 69 million people in 2011.
Edinburgh Airport has reopened but passengers have been warned to expect "significant delays and cancellations" with no flights departing until after 8pm.
– Edinburgh Airport statement
Edinburgh Airport has has now reopened following an earlier incident.
Passengers should expect significant delays and cancellations to flights and should continue to check with their airlines.
No flights are expected to depart until after 20:00.
Police have confirmed that the incident at Edinburgh Airport has been resolved and that "there isn't, nor was there ever, any risk to the public".
The airport was closed and passengers were evacuated this afternoon following the discovery of a "suspicious bag".
A Police Scotland statement said that bomb disposal technicians were "immediately contacted" and a "thorough examination of the bag was undertaken and the contents were deemed safe."
– Chief Inspector David Campbell from Police Scotland's Border Policing Command
We are now satisfied there isn't, nor was there ever, any risk to the public and the airport will now begin to reopen.
We would like to thank the public for their patience and co-operation during the emergency service response.
It is expected to take a number of hours before Edinburgh Airport returns to normal service after its closure this afternoon.
Passengers were evacuated and the airport was closed after police were called to investigate a "potentially suspicious" package at the site.
The process of reopening Edinburgh Airport will take time and delays to flights can still be expected http://t.co/Jqq0G6rrZy
Police have said Edinburgh Airport will reopen after concluding that "there is no threat" at the site, a spokesman told reporters.
Some Edinburgh Airport passengers have been evacuated to a nearby Hilton Hotel after the airport was closed following the discovery of a "potentially suspicious" package inside a bag that is reported to belong to a passenger.
Phone images from inside the hotel show crowds of travellers stood inside the hotel foyer as they await news on when the airport will re-open.
Passengers planning to use Edinburgh Airport today have been advised to contact their airline carrier as the airport remains closed following the discovery of a "potentially suspicious" package in what is believed to be passenger luggage.
Some vehicles appear to have been allowed to leave the airport, according to Twitter user @WaleJamie who said that no cars, buses or taxis were being allowed access into the site.
Edinburgh Airport is closed & not accepting incoming flights. Passengers should not to travel to the airport. Please contact your airline.
Edinburgh Airport is currently closed as we continue to investigate an incident. More info: http://t.co/VGiDNySZVB
Edinburgh Police have tweeted to advise motorists to avoid the city's airport after a "potentially suspicious" package was found inside a bag that reportedly belonged to a passenger.
With rush hour approaching please do not attempt to drive to Edinburgh airport at this time.Airport is closed and it will cause congestion
We can not give a timescale at present and would advise that people do not travel to the airport without contacting your airline first.
No further planes will be landing at Edinburgh Airport as bomb disposal experts investigate a "potentially suspicious" package found in a bag at the airport.
Edinburgh Airport now closed and no more planes will be landing. Passengers asked not to travel to the airport. http://t.co/Jqq0G6rrZy
Passengers at the partially evacuated Edinburgh Airport appear to have been handed blankets by staff, as investigators continue to examine a "potentially suspicious" package found at the airport this afternoon.
A "potentially suspicious" package at Edinburgh Airport was found inside a passenger's bag as it went through security, STV reported.
The suspicious package at Edinburgh Airport was found inside a passenger's bag as it went through security http://t.co/Jqq0G6rrZy