Dundee MPs have been criticised for failing to back Heathrow expansion that supporters say will connect the city to the world.
About 100 new flights between the west London hub and Scotland would emerge from the third runway, the Conservative Government says.
Ministers have effectively promised that Dundee will get a direct link to Heathrow.
SNP MPs abstained in the key Commons vote on Monday night, saying they needed more assurances about what is being delivered for Scotland.
Chris Law, the Dundee West MP, said last year he wants to “Dundee Airport developed and a link established between Heathrow through the construction of the third runway there”.
Mr Law was in New York during the expansion vote as part of a Westminster delegation from the international development committee, which his spokesman said had been pre-arranged for weeks.
Dundee West MP Stewart Hosie voted with his Nationalist colleagues to abstain.
Kirstene Hair, the Angus MP for the Tories, said the SNP representatives for Dundee “sought to pull the rug from beneath Dundee Airport after backing these moves all the way”.
Ian Blackford, the SNP leader at Westminster, said: “One hundred flights means 50 arrivals a week—seven flights a day.
“We are talking about Edinburgh, Glasgow, Dundee, Aberdeen, Prestwick and Inverness. It is simply not enough.”
Chris Grayling, the Transport Secretary, listed Dundee as one of 10 British towns and cities that would benefit from the “win-win” of third runway.
Dundee business leaders have hailed the third runway as a way of boosting the economy through extra visitors and exports.
A spokesman for Highlands and Islands Airports, which runs the Dundee site, said: “We believe the third runway will play a key part in securing long-term aviation connectivity for the UK regions, including the HIAL network of airports.
“Our focus now is to work with the Government and to continue to press for guaranteed slots at Heathrow and ensure that airport expansion benefits the entire country.”
The UK Government believes the third runway will be operational by 2026.
An SNP spokesman said: “The SNP has been clear that whilst a well-designed Heathrow expansion plan would provide significant benefits to Scotland’s economy and connectivity, we could not support a motion which short changed Scottish passengers, airports or our economy.”
