It hardly matters whether you passed from which stream since airlines industry is almost open to all streams. Now since last year one can become a licenced commercial pilot if he has studied physics, chemistry, maths till class 10th. To become flight steward or air hostess one doesnot need physics, chemistry, maths even till class 10th. Only for becoming aircraft maintainance engineer, one has to have an B.Tech degree in engineering. Courses for pilot begin after class 12th and recruitment for flight steward also starts from after 12th or in some airlines after graduation in any stream.