Dragnet 67 to Miami Vice
5 connections
Dragnet 67
Dragnet
Dragnet spun off Dragnet 67
Adam-12
The main characters from Adam-12 appear as witnesses in an episode of Dragnet
Emergency!
Emergency! had a crossover with Adam-12 to find a boy who ran away from the hospital.
Matlock
Both feature the fictional Trans Global Airlines
Miami Vice
Both have characters that have flown on the fictional Trans Global Airlines