Stansted airport in Essex says it is "completely unaffected at the moment" by the air traffic disruption in the South of England.
Thousands of air travellers face delays after air traffic control company Nats experienced "technical problems" at its Hampshire control centre in Swanwick.
The problem led to Nats restricting the number of aircraft flying across the south of England and those taking off from airports.
A Nats spokesman said: "There will be delays, although we are not sure how long they will be."
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Anger is mounting over a new warehousing development in Northamptonshire - being built on top of a 4,000 year old prehistoric monument.
Sunday's marathon was the hottest on record, with temperatures reaching 23.2C.
After some sunshine this evening, it will become cloudy overnight with outbreaks of rain moving east across the region for a time.