"Paul Tomblin" wrote in message
...
In a previous article, "Steven P. McNicoll"
said:
"Blanche" wrote in message
...
Uh....if you're between 18K and 60K in the US, then you are required
to be on an IFR flight plan, hence only at even number altitudes.
33,500 is inappropriate.
That's not correct. You're required to be on an IFR flight plan in Class
A
airspace, but not all airspace between 18K and 60K in the US is Class A.

By the way, 33,500 IS an even number.

Plus 33,500 is a perfectly valid altitude on an IFR flight plan if you're
climbing, descending, VFR-OTP, given a block altitude or on a cruise
clearance.

VFR On Top at 33,500?