Using airlines, that flexibility "recently became difficult for us," she added.

Executives at United reacted more harshly, accusing the commission of using airlines as pawns in a turf battle with its member states.

Mr. Eser said that the association, which has 190 airline members, was not in favor of governments' using airlines as collecting agencies.

The company does not advise employees whether to use American or foreign airlines.

Some frustrated travelers are taking odd routes using other airlines or driving instead of flying to nearby cities.

If bought through a travel agent, such as Brazil Nuts, (800) 553-9959, the visitor can use different airlines.

He flies two or three times a week on business, using scheduled airlines, usually riding in coach class.

It uses international airlines, picking up shipments from a number of shippers and consolidating them by destination.

Lower fares are sometimes available if employees surrender a bit of convenience by using alternative airports or airlines.

Millions of our citizens use low-cost airlines every day.