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.
The man in charge of the commission investigating the case for a third runway at Heathrow has already said some "additional runway capacity" will be needed in south-east England "in the coming decades".
In a speech in October this year revealing the commission's "emerging thinking", Sir Howard said:
– Sir Howard Davies
Our provisional conclusion is that we will need some net additional runway capacity in the south-east of England in the coming decades.
To rely only on runways currently in operation would be likely to produce a distinctly sub-optimal solution for passengers, connectivity and the economy and would also almost certainly not be the best solution in terms of minimising the overall carbon impact of flights and travel to and from airports.
Gatwick airport should be encouraged to build a "robust business case" for a second runway at the West Sussex airport, the transport select committee has said.
They also recommended further expansions to Heathrow airport.
Speaking ahead of the Davies Commission interim report, committee chairwoman Louise Ellman said:
– Labour MP Louise Ellman
Gatwick airport should develop a robust business case for their vision of a second runway
The (committee's) inquiry found very clearly that Heathrow - the UK's only hub airport - has been short of capacity for a decade, is currently operating at full capacity and needs a third runway.
We also suggested that a four-runway proposal for Heathrow might have merit, especially if locating these westwards from the current site could curb the noise experienced by communities under the flight path.
There are serious cases for third and fourth runways at Heathrow airport, a group of MPs have said ahead of the first stage of publication of a Government-backed report into expansion at the west London airport.
The transport select committee said Heathrow was already operating at full capacity and the case for a fourth runway may "have merit".
The Government-appointed Airports Commission is expected to publish its first report into airport congestion in the UK, chaired by former Financial Services Authority chief Sir Howard Davies.
As well as publishing measures to ease airports congestion in the short term, the commission will reveal a short list of extra runway options - a list expected to include expansion at Heathrow.
However, firm proposals will not be made until the commission publishes its second, and final, report in summer 2015 - after the next general election.
Most airports in the UK and Republic of Ireland are advising passengers to check with their airline before leaving, although most are operational.
Here is the latest information from their Twitter feeds:
- Heathrow - Around 240 flights cancelled. Operating a revised schedule.
- Gatwick - Operating as normal
- Stansted - Operating as normal
- Luton - Operating as normal
- London City - First flight is 12:30
- Manchester - Small number of cancellations due to conditions at other airports
- Southend - Dublin arrivals and departures cancelled
- Birmingham - Operating as normal
- Belfast - Operating as normal
- Dublin - A number of cancellations
- Blackpool - Operating as normal
- Southampton - No significant delays
This year has been the safest-ever 12 months for air travel, according to figures out today.
The number of fatal crashes in 2012 and the number of people killed in those crashes fell sharply compared with 2011.
And the fatal accident rate of one per 2.5 million flights made 2012 the safest year on record and almost twice as safe as 2011, flight advisory service Ascend said.
The figures, which relate to airliner safety, showed that there were 15 plane crashes involving deaths in 2012 compared with 25 last year.
The number of people killed in fatal accident crashes this year was 362 compared with 403 last year.
Nearly three quarters of the deaths came in two incidents this year.
Virgin boss Richard Branson told ITV News that he "would urgently like to see the Government allow a third runway at Heathrow" and not having one "is holding the country back enormously" in terms of infrastructure.
He added that "it wouldn't cost the country any money at all to see that investment made but it would pay back many many times over".
Heathrow's Terminal 1 appears relatively peaceful today.
But it's the other end of the Easter break that officials are worried about - will our border controls cope with the influx of travellers coming back in to the country?
"What we need to do is balance the issues of security with the issue of the convenience for passengers," says Labour's Keith Vaz, Chairman of the Home Affairs Select Committee.
"Not addressed, this dangerous cocktail could be a severe embarrassment to the Government. I hope the Home Secretary will take this warning."