So, if anyone wants to provide even more data (thanks!), I've got two surveys to fill out. One is a look at average flying habits; the other looks at per-flight statistics in great detail. The per-flight version has a printable version about the size of a boarding pass that you can print and take with you to the airport, for quicker data collection (though you'll have to enter it online when you get within reach of the Internet).
Thanks in advance for your help.
Overall survey:
https://docs.google.com/spreadsheet/...OFZtcEhKNkE6MQ
Flight-specific survey:
http://ian.im/dia
Printable version:
http://ian.im/diaprint