The airline listed its estimated assets and liabilities in the range of $1 billion to $10 billion each, according to a court filing on Monday.

Spirit Airlines has filed for bankruptcy protection and will attempt to reboot as it struggles to recover from the pandemic-caused swoon in travel and a failed attempt to sell the airline to JetBlue.

The low-fare carrier has struggled to find its footing after its planned merger with JetBlue was blocked by a federal judge.