Provided the expense was a condition of employment or continued employment, it's deductible. If it was for promotion purposes in your same field, or another job in your same field, then it's not deductible.
Assuming it's deductible, you'll enter it under the Deductions & Credits tab in the Employment Expenses section. Under that heading elect to start/update Job Related Expenses.
Select YES and continue.
Select YES again, and continue.
Enter your occupation (Pilot I would presume) and continue.
Select the checkbox next to "You are in the transportation industry" and continue.
Select NO for home office expenses and continue.
Select NO for vehicle expenses.
Select NO you didn't buy any items for use on the job, and continue.
Select NO and continue.
For "Any other expenses?" leave it blank, and continue.
Enter something that best describes this specific certification that was required, followed by the amount you paid, then continue.
Select NO (assuming you were not reimbursed for this) and continue.
Select NO and continue.
Click DONE, and that does it.
