With NFL training camps opening next week, The Post’s looks at the 2019 AFC East the Jets will face this season.

Bills

Coach: Sean McDermott (third season)

Biggest newcomers: Buffalo bolstered the offensive line in front of second-year QB Josh Allen by signing Mitch Morse, Spencer Long and drafting Cody Ford. GM Brandon Beane also got WR Cole Beasley to give Allen a target out of the slot along with WR John Brown on the outside. They brought in RB Frank Gore to see if he has anything left. First-round pick Ed Oliver could have a big impact on the defensive line.

Biggest losses: Kyle Williams has been the leader of the defense for a long time, but the defensive tackle retired after last season. The offense will also look different without TE Charles Clay.

Camp outlook: The Bills are in a similar spot as the Jets. They are hoping for a big leap from Allen in his second season. Buffalo recognized its biggest weakness last year was its offensive line and addressed it in free agency and the draft.

They don’t have many obvious answers at tight end to replace Clay, and they lack a true No. 1 wide receiver.

Their 6-10 record last year hides how well the defense played. The unit kept them in most games and should not experience any drop off this season. The defense finished No. 1 against the pass and No. 2 overall in the NFL. CB Tre’Davious White is a star, and linebacker Tremaine Edmunds showed he belongs as a rookie.

How they fared vs. Jets last season: Spilt, 1-1.

Preseason schedule

Aug. 8: vs. Colts

Aug. 16: at Panthers

Aug. 23: at Lions

Aug. 29: Vikings

Dolphins

Coach: Brian Flores (first season)

Biggest newcomers: The biggest change is at the top, with the Dolphins firing Adam Gase after a 7-9 season and hiring longtime Patriots assistant Flores. They also will have a new look at quarterback. They signed journeyman Ryan Fitzpatrick and traded for Josh Rosen, setting up an interesting camp storyline. They also added DL Christian Wilkins in the draft, and signed former Patriots CB Eric Rowe and TE Dwayne Allen.

Biggest losses: Tannehill was Miami’s starting quarterback for most of the past seven seasons, so it will be strange to see someone new under center. They also moved on from DE Robert Quinn, WR Danny Amendola, LB Cameron Wake, OL Ja’Waun James and RB Frank Gore as they tore down their roster to start a complete rebuild.

see also The Jets' biggest change hasn't even happened yet When the Jets take the field Thursday for their first... Let’s just call this season the Fish Tank. Expectations are low in South Florida. Many believe the Dolphins are tanking in hopes of landing one of the top quarterbacks in next year’s draft. They, of course, deny that.

Rosen is the most fascinating player on the roster. The Cardinals gave up on the first-round pick after just one season. Can he do enough this season to make Miami rethink drafting a quarterback next year? Don’t count out Fitzpatrick either. He always seems to find his way into a starting role.

Wake and Quinn are gone from the defense, making you wonder who is going to rush the passer.

Another thing to watch is how the team reacts to Flores. Typically, former Belichick assistants are not very popular with their new teams. It could take a while for the player to adjust.



How they fared vs. Jets last season: Dolphins, 2-0.

Preseason schedule

Aug. 8: vs. Falcons

Aug. 16: at Buccaneers

Aug. 22: vs. Jaguars

Aug. 29: at Saints

Patriots

Coach: Bill Belichick (20th season)

Biggest newcomers: The defending Super Bowl champs added some new targets for Tom Brady with WRs N’Keal Harry in the draft and Demaryius Thomas in free agency. On defense, they brought back LB Jamie Collins in free agency and traded for DL Michael Bennett.

Biggest losses: Let’s start with the 6-foot-6 hole that tight end Rob Gronkowski’s retirement leaves in the Patriots’ offense. He has been a key piece of the New England puzzle for the last decade. They lost OT Trent Brown and DE Trey Flowers in free agency. Both played well for the Patriots last year on their Super Bowl run but were too pricey for Belichick’s taste.

Camp outlook: Stop me if you’ve heard this one before: The Patriots are the favorites to win the AFC East. The beat rolls on in Foxborough with the Patriots entering another season where a challenger in the division is hard to identify.

The only question these days for the Patriots is whether they can win another Super Bowl after winning two of the past three and three of the past five. Tom Brady turns 42 on Aug. 3, and he showed some signs of slowing down last year. Will this be the year he stops being Superman?

Though the loss of Gronkowski will hurt, Julian Edelman is back and has a few new friends around him with Harry and Thomas.

The Patriots relied on the run at the end of last year with Sony Michel and James White. They may rely on that formula again.

The defense must adjust to life without coordinator Brian Flores, who left to become the head coach in Miami. It appears that Belichick will be calling the defense after Greg Schiano oddly bolted a few months into the job.

People will pick the Patriots apart in September, but they should be where they usually are in December — atop the division.

How they fared vs. Jets last season: Patriots, 2-0.

Preseason schedule

Aug. 8: at Lions

Aug. 17: at Titans

Aug. 22: vs. Panthers

Aug. 29: vs. Giants