It was anticipated that the airline may enter services on the domestic trunk and short-haul international routes.

But not on short-haul routes, which just five years ago accounted for more than half of all flights.

Like the A320, the 737 is a single-aisle aircraft suitable for short-haul domestic routes.

The changes could mean lower fares on international and short-haul routes.

The company furthermore increased frequencies on its short-haul routes.

All Nippon said its A320's would be used mainly on short-haul routes.

The aircraft proved to be useful on "high density" regional and short-haul routes.

In markets where Southwest operated, the average price charged by all carriers on short-haul routes was $56.

That means you buy a single seat for an on-demand flight, typically on short-haul routes between secondary markets.

Some sources suggested the concept was aimed at short-haul routes in Asia.