- https://gallup.wnmu.edu/wp-content/uploads/formidable/75/delta-air-lines-quick-guide.pdf
- https://gallup.wnmu.edu/wp-content/uploads/formidable/75/united-air-lines-quick-guide.pdf
- https://gallup.wnmu.edu/wp-content/uploads/formidable/75/ame-rican-air-lines-quick-guide.pdf
- https://gallup.wnmu.edu/wp-content/uploads/formidable/75/Price-line-quick-guide.pdf
- https://gallup.wnmu.edu/wp-content/uploads/formidable/75/expedia-quick-guide.pdf
- https://gallup.wnmu.edu/wp-content/uploads/formidable/75/UpDaTeD-FaQs-Booking-com.pdf
- https://gallup.wnmu.edu/wp-content/uploads/formidable/75/UpDaTeD-FaQs-United-Airlines.pdf
- https://gallup.wnmu.edu/wp-content/uploads/formidable/75/UpDaTeD-FaQs-American-Airlines.pdf