Delta is ailing, like most large airlines, and the costs of keeping backup planes ready to fly has become prohibitive.

They say that the expense required to keep the computers and other Library equipment in shape is becoming prohibitive.

Fares are $1.20 to $1.60, depending on the length of a trip, and he said they could hardly be raised further without becoming prohibitive.

"The cost of switching has become prohibitive," Ms. Morgan said.

The expense of bringing the old modular construction to modern standards had become cost prohibitive.

And the cost of accommodating athletes at the Summer Games has become prohibitive.

The company said the cost of doing business in the city had become prohibitive.

Before that time, the Vice President lived in his own home, but the cost of providing security for these private residences had become prohibitive.

The cost of providing universal medical care, generous pensions and long vacations has become prohibitive.

Here again the per unit cost of each ship or shipborne aircraft is becoming prohibitive if casualties are to be avoided.