The study was commissioned by economic regeneration agency Cumbria Vision, which has worked with airport owner Stobart Air on a revised application for the development submitted last week.
Stobart Air scaled down its £35 million scheme to improve freight facilities after withdrawing an earlier application when the government called in the plans (Planning, 27 June, p6). The airport building is now smaller than in the original proposal.
The plan was delayed after Carlisle City Council imposed more than 50 conditions on the application.