"Peter Duniho" wrote in message
...
"AES/newspost" wrote in message
...
[...]
Anyway, I'm assuming that "Jackpot 1243" wanted to move up and down
freely between 39,000 and 41,000 feet seeking smoothest ride and best
fuel economy without having to make repeated requests

Sounds like a "cruise clearance". Not sure why those words weren't used
in
the request.

According to the AIM P/CG, a cruise clearance permits flight from a single
specified altitude down to the minimum applicable IFR altitude; the
phraseology is e.g. "Cruise eight thousand". A block clearance, with an
explicit lower bound, is slightly different.

--Gary