Delta is also investigating how Yesuf inadvertently slipped through the system, an airline representative said.

CNN: Delta places elderly woman on wrong flight

Then, advises Trippler, start asking the airline representative at the gate if the flight is going to be canceled.

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Shanghai's airport is now barring other Aeromexico planes from landing there, a representative of the airline told CNN.

CNN: Confirmed cases of H1N1 virus approach 900