Corrected entry: Several times in the film, either Will or Jane goes to the airport just to see the other. They meet up at the gate of their child's departing flight. But the other person wouldn't have a boarding pass, so he or she would not have been granted access to the gate area.
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Correction: For many, many years, they used to let you go all the way to the gate without a pass. The movie never makes mention of when it takes place exactly, so it is plausible.