I believe that should be 39,000 ft ASL.

above sea level.
if you're 39K AGL over Colorado you'd have to be at 51,000 ft ASL.

----- Original Message -----
From: "David Beierl" <dbeierl@ATTGLOBAL.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, March 08, 2011 5:22 PM
Subject: Re: I'll be in Seattle

> At 08:17 PM 3/8/2011, Rocket J Squirrel wrote:
>>What's your intended route?
>
> 39,000 feet AGL.   PVD-MDW-SEA / SEA-MDW-PVD.  If everything's on
> time I'll have three hours to twiddle my thumbs in Midway on the way out.
>
> Yrs,
> d