Frontier Airlines got hit with another round of discrimination complaints today, as a pair of female flight attendants filed a federal complaint alleging the Denver-based carrier does not provide them adequate space to pump milk following pregnancy leave.

The complaint, filed with the U.S. Equal Employment Opportunity Commission, comes one year after four women pilots leveled similar accusations against Frontier.

A spokesman for the airline said its policies and practices comply with all federal and state laws as well as with the relevant provisions of the collective bargaining agreement between Frontier and its flight attendant group.

The complaint comes as the airline — owned by Phoenix-based private equity firm Indigo Partners LLC — prepares to go public, possibly next month. Its parent company, Frontier Group Holdings Inc., filed paperwork for an IPO on March 31.

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