When making any travel reservation (e.g. bus, airline, tours), be sure to contact each transport company and notify them of your oxygen use so they can accommodate your travel needs.
Make all travel plans in advance.
Prepare for typical problems.
Plan rest stops, snack breaks, stretches and short walks.
Plan to travel at cooler times of the day or year.
Follow your home routine as much as possible (e.g. nap times).