The news sent the company's stock plunging. Shares closed at 48 cents, which is down $1.09, or 69.43 percent.
On its Web site, the airline said it will continue its full schedule of flights and will honor tickets and reservations and provide refunds and exchanges under its standard policies.
Frontier's frequent flyer program and customer service programs would remain unaffected, as will wages and benefits, the company said.
"All I can tell you is that our employees are extremely supportive so it's not an adverse relationship," said Joe Hodas, Frontier spokesman.
Suppliers and other vendors payments would be unaffected, the airline said.
"Frontier is committed to delivering exceptional customer service and we intend to continue delivering on that promise with normal operations throughout our reorganization process," said Sean Menke, Frontier president and CEO. "To be clear, we filed for very different reasons than those of other recent carriers, and our customers and employees can be confident that we intend to keep on flying and providing outstanding service and products."
The airline said it made the decision to file for Chapter 11 bankruptcy after First Data changed its procedures, specifically its holdback of receipts from sales of tickets to customers. That, the airline said, severely threatened its liquidity.
"Given the recent progress we have made towards strengthening our balance sheet and obtaining additional financing, it is truly unfortunate that we have had to take this action," Menke said.
