Nice catch Airscan. I was just (1954z) getting MASH A-A on 311.3 (121st ARW freq, OH ANG) as they're passing West into Maine. I checked logs from earlier. MASH 91 and REACH 410 were using 308.8 for their boom freq at 1748z Eastbound. I have this as a Coronet LANT Juliet Primary freq.RCH 410 oceanic clearance was at FL290 M0.73 exiting at PIKIL. Advised Gander Radio they were negative CPDLC. Maybe just broken, or maybe a type not equipped with it ? Anyone getting any A-A from MASH 91-94 ?
Hope this helps.