Powerbook Problems on Airplanes?

My wife travels frequently cross-country, and she tells me that she has a lot of trouble powering on her laptop on the plane. Apparently, this is a consistent problem, and she has to shake it, and press in on the battery, etc. to get it to start. As soon as she is back on the ground it works fine.
Apple has a Tech Note on this, but they claim that cabin pressure in most airlines is below the 3000 equivalent meter max operating altitude. I am checking with the airline to find out if the pressurize to the standard 60 kPa above ambient.
Assuming they do, and it is a problem with the Powerbook, has anyone else ever seen this? Any suggestions on how I can remedy this problem? Thanks!

Just FYI, I've never had a problem like that, using my PowerBook in flight on several airlines and aircraft across the US and on very long flights to Europe and Asia.
It is possible that there is a subtle hardware manufacturing variation that is causing the machine to be a little bit less tolerant of conditions that are close to the edge of the spec. That's my best guess. Like the way my previous PowerBook would lose power if I picked it up, because the logic board was a little loose somewhere (after Apple serviced it, it was fine).

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