The main "fee" that has radically increased is the fuel surcharge, which is not a tax payable to the government, it's a bullshit added fee imposed by airlines w

The main "fee" that has radically increased is the fuel surcharge, which is not a tax payable to the government, it's a bullshit added fee imposed by airlines which may or may not correspond in some way to some cost they have. It would be more reasonable just to say that the opportunity cost of a free seat they gave away in the past is more than the airlines expected for various reasons (higher load factors, higher ticket prices).