Final answer:
John Travolta's busiest years were 1978, 1983, 1996, and 2000, where he appeared in more than two movies each year.
Step-by-step explanation:
The busiest years for John Travolta in terms of movie releases, where he made more than two movies, are as follows:
- 1978 - He starred in 3 movies: Saturday Night Fever, Grease, and Moment by Moment.
- 1983 - He was in 3 movies: Staying Alive, Two of a Kind, and Smothered The Censorship Struggles of the Smothers Brothers TV Show (TV Movie).
- 1996 - He appeared in 3 movies: Phenomenon, Michael, and Broken Arrow.
- 2000 - He was featured in 3 films: Lucky Numbers, Battlefield Earth, and The General's Daughter.
These years demonstrate the times when John Travolta had a high volume of film work, contributing significantly to his status as a prolific actor during those periods.