How about Heathrow goes 24 hours...
Limits movements over night to say 20 total movements in/out per hour..min seating of 200. with ultra quiet aircraft...Spends a few million on noise suppression ie Double glazing..
so that’s 6 hours roughly at 120 movements..
Uses dual runway ops during day...solved..everyone( nearly) happy and growth achieved for minimal cash outlay..easy eh!!