EasyJet has said it will double its presence at Luton Airport and create 2,500 jobs if its expansion plans are approved by the government.
The airline is looking to add more destinations and increase the number of passengers from four million to nine million a year.
But easyJet chief executive Carolyn McCall said the plans were in-part reliant on improvements being made at Luton Airport.
Ms McCall added that Luton Airport could make “a real and immediate contribution to the need for more airport capacity in the South East”, without the need to build a new runway.
But campaign groups have said they want evidence that easyJet would commit to quiet engines and avoid night time flights.
Andrew Lambourne from Hertfordshire Against Luton Expansion, said: “Extra jobs, and benefits to passengers, have to be balanced by effective actions to reverse the increasing noise trend at Luton Airport.
“Noise is a form of pollution, and businesses which create noise need to invest in mitigation for its effects, as well as being prepared to constrain the hours during which noise is made.
“These are not unreasonable demands and we look forward to some specific proposals from easyJet to balance its announcement.”
Luton Borough Council approved plans for Luton Airport to increase yearly passenger numbers, but the airport’s expansion plans are yet to be approved by communities minister Eric Pickles.
If approved, Luton Airport will have 20 passenger screening lanes and nine luggage reclaim belts by the time the work is complete in 2026. Increased retail and seating areas are also being proposed to meet the expected increase in passenger numbers.