I've seen "Home Alone" probably a million times... but I never noticed this one part of the movie that is really interesting!
Remember at the beginning of the movie, when the entire family is chaotically packing for their trip and they order pizza? There's a part where Kevin's dad cleans up after him and they show a shot of the trash can.
It appears Kevin's dad actually throws away Kevin's plane ticket! Yep that's right – Kevin's dad actually threw out Kevin's ticket by accident!That's why they never noticed Kevin’s absence at the boarding gate.