Southwest Airlines has removed its 34 Boeing 737 Max aircraft from its schedule through Aug. 5. 

"While the timing for the return to service of the Max remains unclear, what is very clear is our commitment to operate a reliable schedule and provide the famous customer service you expect from us. Our revised summer schedule allows us to accomplish those objectives," the airline said in a statement. 

The carrier went on to say that it is notifying "the limited number of customers" who have already booked travel and will be affected by the schedule changes. 

Max aircraft have been grounded in the U.S. since March 13 as Boeing works on a software fix to its automated flight control system. Investigations thus far suggest that erroneous information transmitted from an aircraft sensor to the automated flight control system was responsible for bringing down a Lion Air flight last October and an Ethiopian Airlines flight last month. Between the two crashes, 346 people died. 

The grounding initially forced Southwest to cancel approximately 150 flights per day. The carrier has since reduced that number to 90 per day, spokesman Chris Mainz wrote in an email. 

In taking the Max out of its flight planning through August, Southwest will proactively remove approximately 160 flights per day from its schedule, Mainz said.

The Southwest announcement follows a decision by American Airlines to extend until June 5 cancellations of approximately 90 flights per day due to the Max grounding. 

Southwest has 34 Max aircraft out of a fleet of more than 750 planes.

JDS Travel News JDS Viewpoints JDS Africa/MI