However, increased competition from other airlines and a slump in the oil-producing region have led to a dip in airline revenues.

He said the costs of the new measures would be paid from airline revenues, including security surcharges that many airlines impose on international travelers.

Over the years, beds disappeared to make room for more seats, lifting airline revenue.

Denver voters have been promised that no taxpayer money would be used for the new airport, which is being financed with bonds and airline revenues.

When ticket prices are raised as little as 1 percent to recover these costs, travel - and airline revenues - decline.

In normal times, business fares account for as much as two-thirds of airline revenue.

Air travel and airline revenues are still below normal in Australia.

Worldwide, airline revenues from tourist travel will fall $4.9 billion this year, according to a study released on Monday.

These travelers will now be forced to buy unrestricted coach fares, the tickets that provide a large part of airline revenues.

Business travelers feel particularly abused because they account for more than half of airline revenue.