When did Air Force One become a 747?

Related questions

1. Can Air Force One refuel in the air?
2. Do flight prices change throughout the day?
3. How do airplanes see at night?
4. Is there an escape pod on Air Force 1?
5. How many flights are there per day?
6. What medication is best for fear of flying?
7. Do planes fly over my house?
8. Where is Marine One kept?
9. Is it dangerous to live under a flight path?
10. Is living near an airport unhealthy?

Tags

1. #presidential
2. #configured
3. #1970s
4. #which
5. #boeing
6. #series
7. #version
8. #1960s
9. #fleet
10. #force
11. #aircraft
12. #since
13. #plans
14. #highly
15. #customized
16. #operated
17. #specifically
18. #introduced
19. #procure