There are two ways flight training might be deductible (which some of the previous posters seem to be confusing):
(1) If you are a student of an accredited college/university seeking a degree, your flight training might qualify for deduction/credit if it is a requirement of your degree program.
(2) The other way is if your training is intended to improve a skill needed in your current occupation. If you are a CSEL, and working as a commercial pilot, then the cost of getting your CMEL likely would be deductible. Similarly, if you are a working CFI and then get your MEI or CFII, that training also likely could be deductible. Education/training for a new job generally would not be deductible unless part of a degree program (see (1)).
As always, consult your own tax adviser; your mileage may vary.