Some interesting background, the A321-200 is kind of an older passenger plane and part of aging out is there's a big push to convert and sell as freighter and Fedex bought a couple dozen.
Generally the big push to sell the A321 as a freighter is to use it for long distance line haul service so this is going between Shenzhen and some customs clearing warehouse in the USA or central hub. So this is international every trip and not dropping at your local field to do local delivery. So they're kind of implying anticipation of unrest in either Shenzhen or NYC, not just some random farm community in Canada or whatever.
There are certain implications in relying on IR for missile protection; the simplest and most foolproof way to protect against short range IR missiles is to control the land for a couple miles around in every direction aka build a giant airport in the rural middle of nowhere and surround it with a fence and short range can't hit. This jammer is only useful against a threat where there's an urban built up environment around the airport. Its to protect against a threat when landing at O'Hare not when landing at that airport in Denver that is (used to be?) 50 miles out of town. So they're installing this in expectation of civil unrest generally out east in the big urban cities, not out west, at least in the USA. So that's interesting. Of course with covid, everyone who can flee the big cities already has or is trying to, so that has implications also.