I had been doing this for a few years, but it was not considered unusual for a dealer to spend a thousand or 2 (in 1980 dollars) to send a tech to a week or so of 'school', and I know that the schools that flight systems or TVH provide are in no manner inexpensive, but do provide a tech with valuable understanding of the systems they cover. Most manufacturers "national accounts level" fleet purchasers could wrangle a place or 10 (maybe even free) in the factory level training on the units the corporation is purchasing, depending on how many units are being bought, and what price they are being bought for.