Paul McCartney later recalled, "There were millions of kids at the airport, which nobody had expected. We heard about it in mid-air. There were journalists on the plane, and the pilot had rang ahead and said, 'Tell the boys there's a big crowd waiting for them.' We thought, 'Wow! God, we have really made it.'"
Two nights later they appeared on the Ed Sullivan show.
PS. Paul is my favorite Beatle.