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.

A source says a woman who stowed away on a New York to Paris flight entered a security lane reserved for flight crews and was able to evade a standard ID check. While in custody on a return flight, a passenger says,