Will a pilot strike disrupt your summer travel plans? Here's what to know.

Contract negotiations are keeping thousands of commercial pilots grounded at a time when the nation will soon be entering the busy summer travel season. 

American Airlines pilots voted to authorize a strike earlier this month. Southwest Airlines pilots made the same move on Thursday. 

"The lack of leadership and the unwillingness to address the failures of our organization have led us to this point," Casey Murray, the president of Southwest's union, said in a statement. "Our pilots are tired of apologizing to our passengers on behalf of a company that refuses to place its priorities on its internal and external customers."