"Stefan" wrote in message news:d6asj8

Actually, yes, I am so hard. I expect from an ATP to know the rules of the
air he is flying in. I expect his employer to offer appropriate training.
I expect the pilot to prepare his flight.

Knowing the rules, with appropriate training, and prepared for the flight,
verbal slips will still occur. Having flown transports in *exactly* the
environment you described - [have you, Stefan? ] - , I would be willing to
guarantee a very high probability that what you heard was merely a slip of
the tongue. Happens all the time, and controllers on both sides of the
ocean are well cognizant of this. You ought to take a lead from the
controller's attitude. Bear in mind also that climbing to FL150 and
climbing to 15000 ft aren't all that different.

Let the NG know the first time *you* make a low grade error. Enquiring
minds.....