On the pauses when there isn't a massive signal on 6754 kHz you can hear Spanish language speakers on 6755 kHz USB yakking away. Sounds like another possible radiotelephone link, similar to what I heard on 6772.5 kHz USB a few minutes ago....unfortunately the extremely strong military aviation weather transmission on 6754 USB makes listening to 6755 USB impossible
EDIT:
I did some Googling, and in addition to my own logs of activity on 6755 kHz in the past, there's posts from RadioReference and other radio forums talking about Spanish language chatter on 6755 kHz and 6755.5 kHz, so apparently "hiding" right beside the loud Trenton military signal is pretty common.