Hi!
Since you're flying for a fractional, your trips begin and end all over the place. You may use your home of residence as your "tax home", and deduct a ton of stuff.
The basic IRS pub you need to look at is 463:
http://www.irs.gov/formspubs/page/0,,id=11531,00.html
Also, perdiem rates can be accessed at:
http://www.policyworks.gov/org/main/mt/homepage/mtt/perdiem/perd03d.html
As airpiraterob stated, you can claim the difference between the standard gov allowed perdiem (see above) and the perdiem that your company pays you.
I use the specific perdiem rates for the cities I go to. In reading pub 463, transportation workers can also use a generic rate of $38/$40 (pre-Oct 1, 2002 and post Sep 31, 2001) for ALL cities if you wish to simplify it.
When you leave/arrive at your "tax home" from a perdiem city, you may use 75% of that perdiem rate for that day. When I move between two perdiem cities, I use 50% of the day at each one.
Example: Leave DTW on Fri and arrive home Fri. You can use 75% of the DTW perdiem rate (which is $50) for Fri, which gives you $37.50 in perdiem costs that day.
Leave DTW/arrive SDF on a Thursday. I use 50% of DTW and 50 % of SDF for that day. The perdiem rates are $50 and $42 (SDF), so I can use $25+$21=$46 of perdiem for that day.
I track my perdiem rates/cities/nights for a month, and then subtract what our company paid me that month for perdiem. At the end of the year, that is the amount you can deduct on Schd A, unreimbursed business expenses for perdiem.
You can also deduct uniforms, professional publications, equipment, cell phones, parking, mileage driven for work purposes, hotel charges (phone calls, laundry costs, fax charges, etc.), job search costs, office expenses, and the portion of computers/office equipment that you use for work.
Good luck, and PM me if U have more questions.
Cliff
GRB
PS-Thanks to all for posting the various sites mentioned previously. I will check them all out to see if there are more deductions I can take!