Frontier Airlines flight attendants, having reached what they say is a major obstacle in their 15-month-long contract negotiations with the Denver-based airline, plan to picket at Denver International Airport Thursday to bring attention to their salary concerns.

The ultra-low-cost carrier is on-pace to be profitable for its third straight year and is going through a period of growth, planning to hire 800 flight attendants by the end of 2017 and to increase pilot hiring as it adds new routes around the country. But as it expands its staff, Frontier also is mired in negotiations with unions representing both its pilots and flight attendants, and neither are moving ahead quickly.

Read more at the Denver Business Journal