JM21 was the small charter plane which collided with Wayfarer 515. The configuration of this particular aircraft was said to have 8 passenger seats. All on board this aircraft were killed in the crash, as well as everyone in the other plane. ("ABQ")

Trivia

• The callsign, "JM021" shares its initials with Jane Margolis, and Donald Margolis incorrectly adresses the aircraft as "Jane Mike 21" instead of "Juliet Mike 21", then instructs JM21 to disregard this information ("ABQ")