That said, there aren't many marginal seats under the LHR flightpath: Mary McLeod at Brentford and Isleworth (Con-Lab) is the only one that comes to mind.
Electoral Calculus
Majority Sorted Seats
also has Angie Bray in Ealing and Jane Ellison in Battersea as being vulnerable.
And the flight path trials that have brought new noise to rural areas and angered residents have caused alarm and bulging postbags to several "safe" seats. If they are necessary for a new runway, they may be concerning quite a few members of the Cabinet : Gove, Hammond, May, Maude ........