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DENVER (AP) _ The nation's largest flight attendant union said Wednesday it has filed a petition on behalf of Frontier Airlines attendants to vote on joining the union.

A majority of the flight attendants at the Denver-based airline have signed union authorization cards, the Association of Flight Attendants said in a press release.

Kathie Weis, who has worked for Frontier for six years, said flight attendants want to have work rules and scheduling practices in a legally binding contract.

Before an election can be held, the National Mediation Board must validate the union cards. If the petition is approved, it would be the third union election for Frontier flight attendants.

Frontier spokeswoman Tracy Kelly declined comment because the mediation board had not officially told the airline about the petition.