Https://alas.wnmu.edu/wp-content/uploads/formidable/75/1%E2%86%92866-231-4032-delta-airlines-check-in-step-by-step-guide.pdf https://alas.wnmu.edu/wp-content/uploads/formidable/75/1%E2%86%92866-231-4032-delta-airlines-check-in-step-by-step-guide.pdf