A disgruntled passenger must go it alone in a lawsuit accusing American Airlines of canceling his reservation on an international flight for purportedly checking in too late.In a written opinion this week, U.S. District Judge Andrea R. Wood struck the class allegations Lucas Huddleston included in his breach-of-contract suit against American.Wood held the proposed class did not meet the predominance requirement of Federal Rule of Civil Procedure 23(b)(3).Under that provision, questions of law or fact common to the class …