....
union dues
pilot medicals
memberships to professional associations
continuing education/certification in your field (keeping that CFI current)
anything bought specifically for travel (suitcase, alarm clock)
telephone (% that is required by your employer)
bidding service
internet (are you required to do internet based home study?)
.....and regarding the perdiem, off the top of my head...... if you DO NOT use receipts, you are allowed to deduct 75% of the Federal MI&E for your overnight city, MINUS, what is already paid to you by your employer. If you are on the first day of a trip, it is only 50% of the city you first overnight in, and on the last day of a trip it is 50% of the city you just flew out of. If you have receipts, you can deduct up to 100% of the allowed rate (again, minus what you've already been paid).
Sharpen those pencils and keep good records...
herewegoagain