Gatwick says it can handle 11 million more passengers a year by 2030 without needing a second runway.
The airport's publishing plans for its future later today.
Gatwick currently handles around 34 million passengers a year but says it could handle up to 45 million. One of their aims is to get more people to travel to the Sussex terminals by train.
More top news
A 63 year-old man has been arrested and bailed following two drugs warrants.
Wednesday morning's weather for the east of the region
Wednesday morning's weather for the west of the region