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two other wkers wereouho to bringire under control. they say about the causes under investigation. looking ahead now to the unofficial start of the summer travel season, this memorial day weekend which aaa predicts will be one of the busiest on record. more than 42 million americans are expected to travel 50 miles or more, making for some busy roadways and crowded skies. chris hanley reports on what they are doing to avoid a repeat of last year's chaos. >> reporter: the summer floodgate is about to open at airports nationwide as travelers face another summer of turmoil. she is among the 67% of flyers worried about cancellations disrupting vacations. she's heading to dublin next month. >> trusting that the first flight will actually get me to boston is probably the most