Hill would make sense. I tracked down ROMA 64/74 handing off the TREND F-35s to ROMA 65/75 at CHARN (waypoint in Montreal Airspace), then they appeared to let them go near Bismark ND. Here was the complete tanker lineup.
61/62 to 63/64 to 65
ROMA 61 K35R MHZ 59-1464 AE0659 MHZ-MHZ
ROMA 62 K35R TYS 57-1441 AE063F LKZ-LKZ
ROMA 63 K35R WRI 63-8029 AE05AC BGR-WRI
ROMA 64 K10A SUU 86-0029 AE01E0 BGR-SUU
ROMA 65 K35R SKA 63-8874 AE062C BGR-SKA
71/72 to 73/74 to 75
ROMA 71 K35R MHZ 62-3551 AE05A8 MHZ-MHZ
ROMA 72 K35R SLC 58-0027 AE0476 LKZ-LKZ
ROMA 73 K35R LNK 61-0276 AE04EA BGR-BGR
ROMA 74 K35R IAB 62-3554 AE05A7 BGR-WRI
ROMA 75 K35R SKA 62-3559 ADFF0D BGR-SKA
View attachment 104889
Hills it was on CE072
Mont-de-Marsan 10/06/2021 CE072 Westbound (dept)
TREND11-16 LFBM>KHIF
59-1464 KC-135T 351ARS/100ARW/D ROMA61 EGUN>EGUN
57-1441 KC-135R 174ARS/185ARW/IA`ANG ROMA62 EGUL>EGUL
63-8029 KC-135R 141ARS/108Wg/NJ`ANG ROMA63 KBGR>KWRI
86-0029 KC-10A 60AMW/Travis ROMA64 KBGR>KSUU
63-8874 KC-135R 92ARW/Fairchild ROMA65 KBGR>KSKA
TREND 21-26 LFBM>KHIF
62-3551 KC-135R 351ARS/100ARW/D ROMA71 EGUN>EGUN
58-0027 KC-135R 191ARS/151ARW/UT`ANG ROMA72 EGUL>EGUL
61-0276 KC-135R 173ARS/155ARW/NE`ANG ROMA73 KBGR>KBGR
62-3544 KC-135R 141ARS/108Wg/NJ`ANG ROMA74 KBGR>KWRI
62-3559 KC-135R 92ARW/Fairchild ROMA75 KBGR>KSKA
Deployed Airframes,
15-5196 F-35A 4FS/388FW/HL
17-5238 F-35A 421FS/388FW/HL
17-5243 F-35A 4FS/388FW/HL
17-5248 F-35A 421FS/388FW/HL
17-5251 F-35A 4FS/388FW/HL
17-5252 F-35A 4FS/388FW/HL
17-5253 F-35A 4FS/388FW/HL
17-5259 F-35A 34FS/388FW/HL
17-5261 F-35A 34FS/388FW/HL
17-5264 F-35A 421FS/388FW/HL
17-5268 F-35A 421FS/388FW/HL
17-5270 F-35A 4FS/388FW/HL