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27 July 2016, 06:06 | Updated: 27 July 2016, 06:07
Most MPs believe a third runway at Heathrow is the major infrastructure project that will benefit the UK economy the most.
A survey by Heathrow has found more than half of them put the expansion as the first priority compared with just 14% who chose a second runway at Gatwick.
At least three out of four say MPs believe building a third runway at Heathrow is an ``important factor in Britain's future ability to stay connected to the world'' following the UK's exit from the EU.
In December, the Department for Transport announced that further investigation into noise, pollution and compensation would be carried out before a decision was made.
Gatwick claims it is the only project that can be delivered.