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
The cast of the hit ITV drama have revealed what fans can expect from the upcoming fifth series, which starts on September 21.
Saturday's weather with Simon Parkin
Friday night's weather with Simon Parkin