Plan to expand London Gatwick Airport's (LGW) north terminal and construct a multistorey car park are being opposed by various campaign groups and UK ministers.
Although the new developments are in line with government regulations, concerns have been raised about the increased risk of noise, traffic pollution and water shortages.
Two planning applications have been submitted to the Crawley Council by the airport authority for the developments, which will help accommodate five million passengers by 2018.
The potential expansion of the north terminal features extra baggage reclaim halls, new check-in facilities and 900 additional car parking spaces.
A total of £1bn is planned to be invested over five years for the new developments under the airport's capital investment programme.
The airport will not build a second runway before 2019, as per an earlier agreement between the Gatwick Airport and West Sussex County Council.