DALLAS — The union for Southwest Airlines pilots has authorized its members to hold picketing demonstrations over what they call unfair working conditions this summer.

Leaders of the Southwest Airlines Pilots Association say members have repeatedly been forced into working additional days of flying, been stuck without hotels and transportation, and are dealing with flight schedules that have constantly been reshuffled as the airline struggles to keep up with the uptick in flying demand this summer.

The complaints come in a video sent to pilots this week, saying that the demonstrations could happen in the fourth quarter “should Southwest Airlines continue its current trajectory,” said SWAPA president Casey Murray.

The letter comes two days after the union for Southwest flight attendants, TWU Local 556, said members are “weary, exhausted, frustrated and forgotten” by the airline’s attempts to increase flying during the COVID-19 pandemic.

In a statement, Southwest vice president of flight operations Bob Waltz said the airline and travel industry have seen a multitude of operational challenges as we navigate the effects of the pandemic.