DENVER — Frontier Airlines Holdings has agreed with two employee unions to reduce wages and benefits temporarily while it reorganizes under bankruptcy protection.

The Denver-based airline said Wednesday the Frontier Airlines Pilots Association and the Transportation Workers Union each ratified an agreement. The unions represent pilots and dispatchers.

Members of the executive team, including Chief Executive Officer Sean Menke, also have made wage and benefits concessions of up to 20 percent.

Frontier has said it was forced to file a Chapter 11 petition in bankruptcy court last month because a credit-card processing company sought to hold back more money from ticket sales. The carrier also has been struggling with high fuel costs and aggressive competition in Denver.