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Mycteria americana
Though the Australian White Ibis does have a bald, black head it does not have black along the back of the underside of the wings. Also this bird was spotted in Louisiana, that would be out of the range of the Austalian White Ibis
If you look at the 2 suggestions to compare, it looks like Wood Stork is what you have...Ibis has black on the tips of the wings only, where wood stork has black all along the back of the wings. Also check out the head shape