I’m thinking the 797 will have the -8 and -9, following the 777X and 787. It would likely have a 3 by 3 layout with seats slightly tilting towards the center of the aircraft to save space. Carrying 210 passengers in a 2-class layout with a wingspan around 20 feet shorter than the A330 including raked wingtips and advanced aerodynamics to decrease fuel burn, it’d be a massive workhorse, especially with airlines like Icelandair. The engine options (if we only have access to the engines today) would be between the Pratt and Whitney PW1524G and the CFM LEAP-1B. The plane will be made out of mostly composite materials and also offering an ER version with auxiliary fuel tanks. The sheer weight would need a double bogey landing gear and the windows would be, I’d guess, the same as the 777. And to cut boarding times, there would be 3 entrance/exit doors. I believe the A321XLR will be able to compete with the 797-9 alone, as the capacity most likely beats range in the 797.

Im think 797-100, 200, 300 and others

@asteroidbook345 Supported.

What about we discuss this without bias? Some of us prefer Boeing, others prefer Airbus, some don't like either. Let's discuss this imparcially.

@Amaker
Pretty much

@JohnnyBoythePilot Meh. The A321 can challenge the 757 and 797.

@jamesPLANESii Yeah.

797 is abit larger than the A321. It’d probably overtake the 757s

@logizAircrafts
Oh no the A320 family and A321 are definitely great airplanes and I respect the A320 family as a great 737 competitor, but I'm just saying the 757 is in it's own unique market where its kinda too perfect to be replaced by anything.

@JohnnyBoythePilot The 737 is a competitor to the regular A320, not the A321. The 757 always shared it's market with the A321 and both had respectable sales - indicating they should coexist and both are great planes.

@logizAircrafts
Ya I guess you could say that, but IMHO nothing can replace the 757 unless it's Boeing since Boeing made the 757. The 757 is the perfect MoM airplane, and the 737-900ER, A321neo, A321LR, or even the 737 MAX 9 can't replace the 757. Boeing tried to sell the 737-900/737 MAX 9 as a 757 replacement but airlines weren't buying it. So Boeing is making the 797, a dedicated 757 replacement.

@JohnnyBoythePilot Boeing fanboy much?

@logizAircrafts
But why buy A321's when you got a 797 that will be better than both the A321 and the 757??? Waste of money there.

@JohnnyBoythePilot I think that the 757 and the 797 could and should operate alongside the A321 in every airline who has shown interest on the planes mentioned.

The Boeing 797 is gonna be a 757 replacement. To be honest I think some 757-operating airlines are just purchasing A321neo's and A321LR's as stop-gap measurements until a 757 replacement comes along. I think the 757 is too perfect in it's role to be replaced by Airbus and can it can only have a true successor through Boeing.

Boeing TX
8)

@DerekSP I personally think that the 797 will replace the 757 and, if it has a high enough capacity version, maybe even the 767. As you said, the A321 has already a very respectable range , but, if a low fares airline (e.g.: EasyJet) wanted to fly a huge route (e.g.: Singapore to New York - Singapor Airlines Route operated by the A350-900 ULR) on a plane the size of an A321, it might need a new plane. To deliver an astronomical range - similar to the A350 - it might need the updates Airbus fited the A350-900, A350-1000 and A350-900 ULR, like composite materials on the wings and fuselage, allowing for a more complex but streamlined shape. The current sharklets on the A321neo would need to be replaced by something like an A330neo's winglet. Returning to the 797, it would fit the middle-of-the-market airliner spot just as well as the 757 if it can be used as an ETOPS Plane. I believe that the 797 will mix the 737 Max, 757, 777x, 787 and a few technologies from the A330neo and A350. I also believe that the 797 will have a wing bend like a 787, but will sport split winglets like a 737 Max. It's cabin will mix a 787's with the A350's. The construction will be similar to the 777x and A350. In proportion to the wings, the engine will appear to be, approximately, the same as the 787. Talking about the A322 you mentioned, it won't be happening, because the A330neo can fit that spot. I can see that you know what you're talking about.

The 797 will have an impact on the market served by the A321, sure, but it will not replace it. It is aimed to replace aging 757s and also grab a new market segment this is yet unserved by any competing aircraft.
I think that the 797 will have three or four variants; from shorter range and large capacity to long range and smaller capacity, with the long range variants being used on oversea flights.
As for the A321, I don't think a longer range is really needed. The neo variant can (hypothetically) cover a direct route from Australia to Europe IIRC (with a suitable configuration).
A larger capacity variant of the A320 family has been discussed (A322), but the A321 is already quite a stretch (literally), so I think we will see Airbus' MOM plane in a very far future.
All my opinion tho