Https://mechatronics.ucmerced.edu/sites/g/files/ufvvjh1226/f/webform/1866-231-4032-southwest-airlines-check-in-easy-follow-steps.pdf https://mechatronics.ucmerced.edu/sites/g/files/ufvvjh1226/f/webform/1866-231-4032-southwest-airlines-check-in-easy-follow-steps.pdf