The airport wants to increase passenger capacity to 19 million per year and amend noise contours.
A public inquiry has begun into London Luton Airport's expansion plans.in December.
The agenda included seven areas they considered to be the main aspects of the application, which were air quality, climate change, the impact of noise, sustainability, socio-economic implications, the influence of other considerations on the overall planning balance, and whether it would be consistent with the local development plan and other policies.
Local protest group Luton and District Association for the Control of Aircraft Noise said it was pleased there would be an inquiry. "We expect the hearings to shine some uncomfortable light on how the borough council and the airport failed to ensure the required balance between growth and mitigation, apparently focusing on maximising revenues instead."