off long island should be ZBW?
the two audio feeds i would check
Boston Center (HTO31 Sector)
Boston Center (SOUTHIE49 Sector)
unfortunately these two feeds are down since beginning of august :/
but i'm quite sure that are the frequencies they could've been at the tip of long island.
after that they could have maybe been on new york / washington center
New York Center (Sector 86 Atlantic) 133.500
Washington Center (Sector 59 Sea Isle Hi) 133.125
but to be honest they may be already a little low at that point and so far i didn't hear anything when skipping through the relevant bits.
now before the turbulence encounter you can hear them on:
Boston Center (ACK17 Sector) 133.450 ....... 18:20Z switched to 128.75
(you should be able to find them on 33.45 before that time but i didn't check that)
Boston Center (CAPE18 Sector) 128.750 ....... 18:29:59Z cleared to descend FL280
can't find the switch to the next frequency but ack17 takes scan priority it seems over cape18
but other planes flying similar routes are being switched to the frequencies i mentioned above which are out of service at the moment. so i assume they were switched there.
after that it goes to a guessing game where they were switched for the abnormal descent. they went straight towards philadelphia.
and with a little educated guessing who's airspace they were descending through i found them again at 18:51Z checking in with
New York Departure (Liberty South) 124.750 (
https://www.liveatc.net/archive.php?m=kewr_app_lib_s)
18:54Z descend 14000ft
18:55Z descend 13000ft
18:57Z descend 10000ft
18:59Z contact PHL approach 119.75
yeah and so on i guess you should be able to find the rest