On American, they call it "random" but the security guy hovers behind a screen and "randomly selects" the first 2 people getting on the plane. This happened to me once and I learned my lesson. Others were chosen after, this selection appears to be random as they pass the boarding pass through the machine and it gets rejected.
Total bs you ask me. The frequent fliers are more than likely the last people who should be subjected to extra searches. Have any hijackers ever been Executive Plat or 1K? I highly doubt it.
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That's what I'm talking about.