Lots of copy cats.
In all, 15 hijackings similar to Cooper's—all unsuccessful—were attempted in 1972
There were no further notable Cooper imitators until July 11, 1980, when Glenn K. Tripp seized Northwest flight 608 at Seattle-Tacoma Airport, demanding $600,000 ($100,000 by an independent account), two parachutes, and the assassination of his boss.
However, a quick-thinking flight attendant had secretly drugged Tripp's alcoholic beverage with Valium. After a 10-hour standoff, during which Tripp reduced his demands to three cheeseburgers and a head-start on getting away, he was apprehended.
There were no further notable Cooper imitators until July 11, 1980, when Glenn K. Tripp seized Northwest flight 608 at Seattle-Tacoma Airport, demanding $600,000 ($100,000 by an independent account), two parachutes, and the assassination of his boss.
However, a quick-thinking flight attendant had secretly drugged Tripp's alcoholic beverage with Valium. After a 10-hour standoff, during which Tripp reduced his demands to three cheeseburgers and a head-start on getting away, he was apprehended.