Allegiant Air and a union representing 600 flight attendants say contract talks have stalled and the National Mediation Board is being asked to step in.
Transport Workers Union of America negotiator and flight attendant Debra Petersen-Barber said in a statement Friday that tentative agreements have been reached on several issues. But she says the two sides haven't agreed on issues including pay, compensation for extended delays and union dues deductions.
Company spokeswoman Jessica Wheeler called mediation a standard part of negotiating.
She says Las Vegas-based Allegiant is committed to balancing the interests of union members with interests of the business.
Allegiant pilots last month voted to be represented by the International Brotherhood of Teamsters.
Publicly traded Allegiant Travel Co. (ALGT) specializes in airline service between smaller cities and resort destinations.