I had to pay for my own air travel for Army Reserves. How do I claim it?

[KurtL1]

You are able to deduct the travel expenses in the Miscellaneous Itemized deductions subject to the 2% floor. 

The Miscellaneous Itemized Deductions Subject to the 2% floor has be eliminated for most occupations, However, if you are an Armed Forces reservist, a qualified performing artist, a fee-basis state or local government official, or an employee with impairment-related work expenses you are allowed to deduct employee business expenses.

To enter these expenses:

1. Select Deduction & Expenses at the top of the screen
2. Select Employment Expenses
3. Select Job Expenses for W-2 Income
4. Answer the questions. One question will ask for your occupation enter Armed Forces Reservist
5. Continue and enter your expenses.

[mlduck]

I'm following the directions, but when it comes to enter expenses, there is only expense for a vehicle, I traveled using commercial airlines. The software isn't allowing an input of expense besides lodging, parking, meals, and ferry. None of these are for airline ticket expenses.

[DMarkM1]

That is correct.  Per IRS instructions (see page 4), the deduction for armed forces reserve travel is limited to the regular federal per diem rate (for lodging, meals, and incidental expenses) and the standard mileage rate (for car expenses), plus any parking fees, ferry fees, and tolls.