wrote:
Interesting. So did all the time above 18,000 count as instrument
conditions, even though we could see the horizon some of the time? Or
is it only the time we were in IMC?

The FAA is pretty lenient in what constitute loggable instrument
conditions. If the horizon is indefinite enough to require
instruments (dark night, legally VFR but hazy, etc...) they
will allow it. Just being in the class A, I don't think so.