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One airline passenger refused to have a Thanksgiving travel meltdown solo -- sparking chaos when he yanked open the emergency exit as the plane was taxiing in Atlanta ... and that stunt got him slapped with charges real quick.

It happened Tuesday at Atlanta’s Hartsfield-Jackson Airport on KLM Flight 622 headed for Amsterdam -- when 32-year-old Johannes Van Heertum freaked out, dialed 911 from his seat, claiming he spotted someone with a weapon ... then popped the emergency exit and sent the inflatable slide blasting out, according to a press release from Atlanta PD.

The plane rolled back to the ramp, where police stormed on board and hauled Heertum off. Cops say their preliminary investigation points to a mental health episode -- claiming he genuinely thought he saw a weapon

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