Officials reiterated their need to reduce wages and benefits to levels achieved at other large carriers.

Now try to imagine this attitude from the "innovators" at most massive carriers.

Such frictions have taken their toll at other carriers, however.

That could quickly reduce United's cushion of cash, according to the two executives at rival carriers.

But he urged members of frequent-flier programs at those airlines, and other carriers, to start using their miles.

Workers at other carriers often go for long stretches without ever seeing a top manager.

Delta's pilots, like those at other carriers, must leave at age 60.

It pays employees less than at other carriers and does not have a traditional pension plan, only a 401(k) program.

But many industry analysts and executives at rival carriers dispute that.

Executives at several carriers predicted United would face opposition to its application.