The Government is expected to decide its response to the Airports Commission this month, with an announcement expected “soon after”.
The Commission, led by Sir Howard Davies, concluded in favour of a third runway at Heathrow when it reported in July.
Graham Brady (pictured), chairman of the 1922 Committee of backbench Tory MPs, told the Guild of Travel Management Companies (GTMC) domestic conference in London on Tuesday: “There has to be a Cabinet decision quite soon, [and] I would expect the decision to be announced very soon after.”
There is speculation the Cabinet will make a decision in mid-November.
Brady, MP for Altrincham and Sale West in Greater Manchester, told the GTMC: “Spending vast sums of money to set up the Davies commission and then ignoring its findings would be odd.
“If the Government is not going to implement Davies it needs to offer an alternative.”
He added: “Most on the Conservative backbenches are not terribly exercised about how and where extra [airport] capacity is provided, but there is a very clear majority on the need to get on and provide it.
“Some MPs have a particular constituency interest, but there is a very clear majority for whatever is announced.”
However, Brady pointed out the Conservatives have only a 12-seat majority in Parliament and said: “A small number [of MPs] could make quite a big difference.
“The Ulster Unionists are very interested to see increased capacity and connectivity. The SNP is pressing to see Scotland’s interests served. [But] Labour will probably be divided on it.”
He added: “I believe there will be a vote, but the status of it is not clear.”