United Airlines said Friday it will start requiring minimum stays for nearly all domestic flights beginning in October. It is also raising its cheapest fares by as much as $90 one-way.

The Chicago-based airline has been among the most aggressive in the industry in pushing fares and fuel surcharges higher in recent months, and its latest policy could prompt other carriers to consider following suit.

Starting Oct. 6, most United fares will require a one- to three-night or weekend-night minimum stay,

Major carriers scrapped most minimum-stay rules — put in place largely to discourage big-budget corporate travelers from snatching up the cheapest seats — years ago, although a number of airlines have been tightening up restrictions and tacking on fees in recent months as the price of fuel has soared.

United and US Airways last week joined American Airlines in charging passengers $15 to check their first piece of luggage.