Discount carrier Spirit Airlines, overwhelmed with continuing financial difficulty, returned to bankruptcy court to try a second reorganization under Chapter 11 protection, the company announced Friday.

“Today, Spirit took a proactive step to build a stronger foundation and future for our company,” the company said in a letter to customers made public Friday afternoon. “We have voluntarily entered the Chapter 11 restructuring process to ensure the long-term success of our airline.”

“The most important thing to know is that Spirit continues to operate and offer high-value travel options,” the letter added.

It also told travelers the following:

Flights will continue to operate normally.

Travelers can use tickets, credits and loyalty points.

Customers may continue to benefit from the

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