You may remember Dave Carroll from music videos decrying the state of United Airlines customer service.But the airline keeps finding ways to inspire new songs: After famously breaking his guitar, United Airlines has managed to cause further trouble for David Carroll by losing his luggage — just as the Canadian singer-songwriter was en route to deliver a speech about customer service. You cant make this stuff up. There have been two videos so far, both decrying Uniteds baggage handling and subseq