Frontier Airlines, the latest airline to file for bankruptcy, was pushed over the brink by a problem that could spread to other carriers...

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NEW YORK — Frontier Airlines, the latest airline to file for bankruptcy, was pushed over the brink by a problem that could spread to other carriers: credit-card troubles.

The carrier on Friday blamed its Chapter 11 bankruptcy protection on a cash squeeze caused by its credit-card processing company, which has decided to keep a larger chunk of the Denver airline’s ticket revenue.

The move ends a policy under which the processor, First Data, passed on most money from ticket sales to Frontier. The change is intended to protect First Data, which would be on the hook for ticket refunds if Frontier stops flying. Frontier plans to continue operating while in bankruptcy.

First Data’s decision represents a new threat to an industry facing jet-fuel prices that have soared 74 percent in one year; a new government focus on safety that has grounded thousands of flights in recent days; and tight competition and falling demand that, combined, have limited carriers’ ability to raise prices.

“It’s just a godawful time for this industry,” said Bob Mann, an independent airline consultant. “This illustrates the uncertainty of capital markets to a T.”

ATA Airlines, Skybus Airlines and Aloha Airlines all have filed for bankruptcy in recent weeks. Champion Air plans to shut down and MAXjet Airways went bankrupt in December. All cited some combination of high fuel prices and falling demand, among other factors.

While it’s not uncommon that banks processing airline credit-card transactions hold a certain amount of a carrier’s proceeds in their own accounts until a passenger completes his or her travel, it is unusual for a processor to suddenly change its cash-withholding policy, analysts say.

In the case of Frontier, the new requirement — known in industry speak as a holdback — was the proverbial straw that broke the camel’s back.

“We believe that we currently have adequate cash on hand to meet our operating needs,” Frontier Chief Executive Sean Menke said in a statement.

“Unfortunately, our principal credit-card processor very recently and unexpectedly informed us that, beginning on April 11, it intended to start withholding significant proceeds received from the sale of Frontier tickets.”

Such a “change in established practices” would throw a serious wrench into Frontier’s cash forecasts and business plan, Menke said. The bankruptcy filing prevents First Data from imposing the new cash-withholding requirement, he said. The airline also threatened to sue First Data.

“The terms of our agreement with Frontier Airlines are not unique; they are considered standard industry practice and terms originally agreed upon by Frontier,” First Data said in a statement.

“They do this because … they’re concerned that a carrier will use the proceeds in advance of travel occurring and then not have the funds to actually perform the travel,” said Mann, the airline consultant.

It’s not the first time credit-card companies have imposed cash-withholding requirements on airlines. Many did so in the months after the Sept. 11, 2001, terrorist attacks because of worries about the industry. Several airlines, in fact, declared bankruptcy in the years after the attacks, due to the downturn in business and by the recession earlier this decade. Strict cash-withholding requirements were a factor in Delta Air Lines’ 2005 bankruptcy.

Now analysts think most larger airlines have sufficient cash to weather the current economic downturn and spike in fuel prices. The six largest airlines — American, Delta, United, Northwest, US Airways and Continental — have a combined $20 billion in cash on their balance sheets, Mann said. Their credit-card processors won’t likely change withholding requirements unless there is a significant change in operating conditions.

It’s the smaller companies with less cash that are more at risk of facing new cash-withholding rules, analysts say.