WHITE PLAINS, N.Y. — Spirit Airlines is making "massive progress" to revitalize the airline, the carrier's restructuring lawyer Marshall Huebner said in a court hearing Tuesday.

The struggling budget airline has reached an agreement with some of its debtholders for up to $475 million in debtor-in-possession financing, a lifeline that bankrupt companies can use to continue operating, as well as $150 million from a major aircraft lessor, Huebner said. The agreements are subject to court approval.

Spirit last month filed for its second Chapter 11 bankruptcy protection in less than a year after high costs, weaker demand and a host of other lingering problems drove more than $250 million in losses from when it emerged from its first bankruptcy in March through June.

The carrier has been ra

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