Well, the question is what costs do you apportion to a "YE passenger carried" and how much of it is things like scholarship and how much of the foundation overhead you apportion to belonging to YE. Frankly, if you make wild guess that they fly 80,000 YE a year (the YE site says 1.6M since 1992), and divide that into the overall foundation annual (2011) budget of 2.6 Million, it works out to $32/child flown. If you're willing to realize the foundation does other things (like the museum, other educational actiivities, etc...) it's going to be less.