My favorite source of info on flights are MonkeyWerx on youtube and myself. You can download a few different apps as well as use websites. I think the one I use cost me $5 a year but I do not put one above another so I won't list its name. You can find youtube videos on them as well as just duck duck go searches. I watch monkey because he just gives me the Special Forces Contractor vibe. I've known many of those people and he just seems to have all the same mannerisms. I may be wrong but I don't think I am.

Yes, Monkey Werx has been my main source for looking at mil movements. Was following him back on twitter too, but I think the one here is maybe a fake account. I've gone to the site he uses, but don't have enough skill to detect normal traffic from unusual. He seems pretty straight-forward and doesn't overdo the speculation, so I've found him fairly reliable.
The P8s he's watching lately off the FL coast have me puzzled. They're patrolling over fairly shallow waters from Jax and south of there. Doesn't seem like an area where it would be hard to find a stealth sub, yet he implied that there were so many P8s over the past 2 weeks because they keep losing track of one there? The deeper waters are fairly far from the North Florida coast... Anyway, not sure what to make of it, but neither is he.