Originally Posted by RVSM Certified

Aaaah, yes. Thanks, I can see it now. Got it!

Now, what about the IAS -vs- True delta that comes with an increase in DA? And, [B]how much flight planning time do you spend going over the details of the atmospherics [potential HDA problems] of your destination and alternate airports? Is it something you consciously handle at the flight planning phase, or do you just deal with it, if it becomes a problem once you get to your destination airport?