United and several other major carriers said last week that they would reduce their capacity by 20 percent.

It did so, the carrier said, to lower operating costs.

But other major carriers said they had not decided whether to go along, and this made American's own plans tenuous.

The carrier said it might raise the fare to $998 when the service began.

The carrier has said it wants $90 million from those workers.

The four carriers said the system would handle 75 million travel arrangements a year by 1990.

Some major carriers said fares could change as of April 1, when prices for the coming season.

The other major carriers said their flights were already filled.

Last month, many local carriers said they would reduce these charges in July.

It will be at least a few days before American returns to normal, the carrier said.