About 15% of airline passengers are selected for:

Name: About 15% of airline passengers are selected for:
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Secondary screenings are a routine part of air travel security measures, where a passenger's belongings and/or person are thoroughly checked for threats before boarding. This is done for the safety of all passengers and crew members. The other choices (piggybacking, delayed flights, extra baggage allowance) do not typically apply to a specific percentage of passengers.

About 15% of Airline Passengers Are Selected For