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CHICAGO — United Airlines is launching a new fare system in January that includes a new option called a basic economy ticket — but not everyone is on board with the plan.

Basic economy passengers will only be allowed to carry one small item on board that must be able to fit under the seat. Any bag larger than that can be checked for a fee. Passengers cannot use overhead bin space.

United predicts the new fare structure will bring in $1 billion by 2020, Fortune reported.

The airline said the lower-fare option will also smooth out the boarding process because these ticket holders will be the last group to board the plane. The basic economy ticket also doesn’t allow passengers to choose their own seats.

“[Previously], the last group on the plane is wondering around looking for a place for their bag and sometimes they have to tag it and move it under,” United spokesman Jonathan Guerin said when the plan was announced in November. “That slows down the entire process.”

With less than a month until the new fare structure goes into effect, one lawmaker wants United to reverse the decision.

“The overhead bin is one of the last sacred conveniences of air travel and the fact that United Airlines — and potentially others — plan to take that convenience away unless you pay up is really troubling,” Buffalo’s WKBW News quoted Sen. Chuck Schumer as stating.