southwest airline flight. look at that piece of roof missing. that blew off in midair. 35,000 feet. investigators found widespread cracking, that's their word, on the aging 737 300 jet, similar cracks on three more planes on this "american morning." good morning. it's monday, april 4th. welcome to "american morning." >> we have a lot to talk about this hour including the latest on that southwest, they're grounding planes, canceling flights as they try to get to the bottom of this. president obama officially kicks off his re-election bid for 2012 today. he released a new campaign video. when all the campaigning is said and done he's hoping to raise a billion dollars for his campaign war chest. oil spill in the atlantic kills hundreds of thousands of penguins. we'll tell you about the attempts to save the northern rock hopper penguins. >> charlie sheen's 20 city tour