War Games/WMG

The movie's set Twenty Minutes Into the Future (of 1983).

 * The Ordinary High School Student has an in-home internet connection at a time when many universities didn't.
 * He buys an airline ticket online almost 10 years before commercial use of the internet was enabled (and never gave credit card info, real or stolen).
 * Of course, by that time...
 * He'd hacked into the airline company's reservation computer, the same one that ticket agents access through terminals. It wasn't intended for consumer use. (This is also why he didn't have to give payment info; he was stealing the ticket.)
 * According to Todd Fischer of Fischer-Freitas (which supplied Dave's IMSAI computer), "This early version of the script (sent by the Product Placement facilitator) had the story line placed in the future and seemed to depend more on fantasy and conjecture rather than technical reality."