Usually you are not allowed to check through any baggage, or are allowed just one bag in some cases. You are allowed however, to carry on as much luggage as the particular airline will permit. If you're only acting as a courier on the outbound flight you can check baggage as normal on the return trip. Air courier companies utilize major airlines like TWA United, American, British Airways and other international airlines. Couriers have been allowed on occasion to upgrade to first class at their own expense.
All tickets are round-trip tickets except in rare cases.
Usually you save up to 85 percent of the regular airline ticket price. And in some instances you can fly free. The range is all over the board, depending on the season and demand, but the discount is substantial. During the summer, rates are generally higher than any other time of the year, but you still fly cheaper as a courier than with other discount fares. In short, traveling as an air courier will save you hundreds of dollars on each trip you take.