Regional carrier Flybe claims it has seen a surge in ticket sales since pledging to pay the Air Passenger Duty (APD) on fares.
Flybe made the offer last week to highlight the unfairness of APD, which adds £13 per passenger to the cost of every one of the airline’s flights taking off from the UK.
The offer applies on 116 of Flybe’s 194 routes and to flights between October 27 this year and October 25 2014.
Within three days of its launch, Flybe said it “received a surge in ticket sales” and more than 2,000 customers had signed a petition to Chancellor George Osborne.
A Flybe spokesman said: “We want to thank customers for their support in helping us highlight the unfairness of APD.
“This campaign was not just advertising our flights, but an attempt to raise the issue of APD and the double hit UK domestic passengers suffer.”
Passengers on domestic flights pay APD on both legs of the journey. Those flying from a regional airport via Heathrow also pay APD on two fares.