Part 1 of this post focused on estimating emissions from commuting. This post focuses on emissions from air travel.
In order to calculate emissions from air travel, you will need to determine the total number of passenger air miles paid for by or through your institution. The challenge is that institutions generally don't track this data in one place (if at all) so you may have to pull together data from several entities, including the business office, study abroad office, athletics department, and your institution's travel agent(s).