At the largest terminal at New York’s John F. Kennedy International Airport on one of the busiest travel days of the year, security lapses enabled an unticketed passenger to board a plane to Paris in a shocking breach that one aviation expert said should serve as a “wake-up call” for the airline industry.

The same passenger who stowed away on a Delta Air Lines flight to Paris caused a disturbance on a flight to New York on Saturday, an aviation official said.