Steve123uk yeah I was slightly worried about that myself. I've done it a few times with a similar connection, and only once been too late and bumped onto the next flight down.
Pinched from Jack's Flight Club? I'm not even a member of it. I just went to book a flight and spotted the good deals. It's not pinched from anywhere. Additionally it does include checked baggage, see the '23kg' next to checked bag.
Wouldn't advise 1h 50 mins at Atlanta. High chance you will no make it off the plane and through immigration then reboard the next fight.
Jacks flight club nicks flights from fly4free, secretflying, flighthacks, flynous to name but a few. And its very normal for OTAs like netflights to price much cheaper. They know if you have an issue with flight change/cancellation you will pay thru the teeth. Best to pay direct with airline.
Hot.. But pinched from Jack's flight club!