Flight attendants are represented by the union at Spirit Airlines Frontier AirlinesTuesday was a successful day for the carrier merger. This cleared the way for the removal of a major labor issue amongst the most important worker groups.

According to the Association of Flight Attendants, CWA reached a “merger transition arrangement” with Frontier. This agreement prohibits furloughs of flight attendants and guarantees other protections.

“We support the necessary regulatory approvals that will improve competition, increase consumer options and experience, and maintain and grow good union jobs,” Sara Nelson, AFA’s president said in a union announcement.

A day later, they reached an agreement. JetBlue AirwaysLaunched a hostile takeover bid for Spirit. Spirit Airlines had rejected JetBlue’s initial $33 per share all-cash proposal earlier this month. JetBlue made Monday a $30 per share tender and asked Spirit shareholders not to support the Frontier Spirit tie-up.

The Transport Workers Union represents JetBlue’s flight attendants. John Samuelsen the president of TWU, stated to CNBC last month, that TWU would try to be a representative group for a JetBlue and Spirit flight attendants group, if this deal was made.

Justice Department approval would be required for either combination of airlines.