QUERY,
I suggest you take a look at
Visa Explaination from U.S. Embassy in the U.K..
A small section from the page says:
"
Nonacademic (M-1) Visa: A student wishing to pursue a course of study which is not principally academic in nature at an established vocational or other recognized nonacademic institution such as a post secondary vocational or business school requires an M-1 visa."
Please read the entire page. In addition you will find in the footnotes (not on that page) that any course where you are present for more than 18 hours a week is concidered a full time course requiring a visa.
Happy and Safe Flying,
Capt. Richard J. Gentil, Pres.
Naples Air Center, Inc.