Spirit Airlines and its 1,300 unionized flight attendants reached a tentative five-year contract that contains pay raises for the first time in six years, the two sides announced Friday.

The Miramar-based air carrier said the National Mediation Board helped the parties reach an agreement. The attendants are represented by the Association of Flight Attendants, which is part of the Communications Workers of America.

The attendants have been operating without a contract after a four-year deal expired in 2007. The new tentative agreement was reached on the cusp of a 30-day cooling off period that could have led to a strike.

The airline did not offer any details in the proposed deal.

But Todd St. Pierre, president of the union’s master executive counsel at Spirit, said the agreement does call for pay increases and other “improvements” for its U.S.-based members. He declined to discuss details of the proposed pay increases, saying they had to be presented to the members first. First-year attendants make slightly more than $18 an hour with longer term members able to top out at slightly more than $32 hourly for a guaranteed 72 hours a month of flight time.

St. Pierre said the union intends to start electronic balloting on the deal at the end of January and complete the voting by Feb. 7.

Spirit operates 250 daily flights to more than 50 destinations in the U.S., Latin America and Caribbean.

Spirit stock was off a fraction in trading Friday at slightly below 43.