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The serial number of the machine you had on file with myAir previously had a relationship with a provider. That provider has removed this machine from your account so it has also been removed from your myAir account.
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I guess my machine is now off the radar. I never use myair so it doesn't make any difference. Since the "new" DME doesn't have my machine details I don't guess they will be able to fiddle with it.
Now I no longer have any concern over the airplane mode issue.
foss