They’re not the first….

Back in the 80’s ( or maybe the late 70’s?), El Al airliners used to carry defensive aids, though they were (IIRC) passive in nature rather than active “anti-missile” systems.

(Some of?) their airliners carried flare pods on the engine pylons, in hope of protecting them from hand launched heat seeking SAM’s which were percieved to be a realistic threat at that stage.

Photos of the modification appeared in the monthly mags at that time.

Paul F