Selling government airline tickets if one travels by land

Is it permissible to sell government airline tickets that were given to me, because I traveled by land?

Praise be to Allah, and blessings and peace be upon the Messenger of Allah:

there is nothing wrong with selling the tickets if you have no need of them, unless your traveling by land will cause some delay in your work. In that case it would only be permissible for you to travel by the means approved, i.e., by air.