it can land on 32 in Boston which is 5k feet. With the pad off end about another 500 feet is there that the plane can over run the runway onto the pad but it isn’t included in the legal ALD. I was deadheading on one when the crew landed. Wasn’t full but it was at least 110 on board maybe more. Didn’t seem difficult or too aggressive stopping and they turned off at J1, that’s about 4100 feet, so I’d imagine ACK at over 6k should be no issue and EYW is almost the same length. Though T/O in EYW might be another story if carrying fuel for an alternate. The issue I could see in the cape islands are the taxiways, the 190 barely fits on some of them and the engines are over the grass, I’d imagine the gear track width of the 220 is wider.