Just Cause 4 - A Game of Chicken Trophy Guide / Achievement Guide - Crash into a flying airplane with your own plane [Bronze]

Head to the airport in region "Islas Intichayes" (bottom right corner of the map). You can steal an airplane there and fly it into another airplane that arrives (or departs) at the landing strip. It doesn't matter what sort of airplane you're using or flying into.
You may also request a fighter jet via airdrop if you've unlocked it already (which you get by liberating regions).