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The problem with airplane mode is that they are often not well tested (they usually do turn off the wireless, but they often have side effects). I would not be surprised if this mode drained the battery. The only way to confirm is to repeat the test, perhaps for a longer period, with a fully charged battery and have others try the same test.
On my old Nokia 770, I don't think WiFi had much effect on battery life even when it was not present. This is because it was only turned on when I asked for internet access, and was automatically (and aggressively) turned off when not in use. So airplane mode with WiFi on may not be a bad default setting, except on an airplane.
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