By Toby Sterling

AMSTERDAM (Reuters) -The Dutch government is set to press ahead with plans to cap the number of flights at Amsterdam's Schiphol Airport next year, pending a decision at a cabinet meeting on Friday, the transport ministry said.

Airlines that use Schiphol including Air France-KLM have sued to try to prevent flights at Schiphol, one of Europe's busiest airports, being capped at 460,000 per year, 8% below 2019 levels,. They say it would harm business and violate previous agreements.

The government's main reason for the cap is to address noise pollution, but it has also cited the need to reduce greenhouse gas emissions, as well as recurring logistical problems at the airport. Schiphol itself supports the cuts.

A transport ministry spokesperson said some details of the plan had not been finalised. If the cabinet approves a plan on Friday, the government will then inform the European Commission, which must approve or reject it within three months.

"The expected decision of the Dutch government is arbitrary, ill-thought out and undercuts procedures normally used," said Ourania Georgoutsakou, managing director of industry group Airlines For Europe (A4E) in a statement.

KLM called the cap "incomprehensible" and said implementing it would damage the Netherlands.

Airlines opposed to the ban are appealing to the Dutch Supreme Court after losing an appeal in July.

The International Air Transport Association (IATA), which supports the airlines' case, on Thursday told the Dutch caretaker government not to proceed ahead of a national election in November.

"In a few months’ time, this government will not be accountable for the severe consequences that may follow from the Schiphol decision, particularly with respect to relations with the Netherlands’ trading partners, and lost jobs and prosperity at home," IATA said in a statement.

Separately, the transport ministry spokesperson confirmed a report in newspaper De Telegraaf on Friday that the U.S. Department of Transport had sent a letter airing concerns about the cap.

The spokesperson could not confirm contents of the letter, which De Telegraaf reported included a warning that a cap would jeopardize current agreements between the countries on landing slots.

(Reporting by Toby SterlingEditing by Mark Potter)