A321N can operate OTP-CMB routes without a problem, same goes with CMB-MXP, CMB-FCO and maybe even CMB-ZRH? etc.. UL could pick up A321NX/NYs to begin routes to those destinations, UL could also use the A321 XLR or LR or NEO for that matter on long haul routes where much demand is not needed for a widebody aircraft, such as PVG-CMB, PEK-CMB, ICN-CMB etc.

A321Ns can be used as a replacement for A320's that UL has..

To run above routes efficiently, UL should have at least 35 aircrafts and at least 15 of them has to be long range widebodies.

UL may keep around some 320s considering they do certain routes such as GAN.
considering that the A321N is more fuel efficient than the A332, I guess it would be viable to go that way,(correct if i'm wrong)
as of A321NX, which would be better- the -251NX, the -252NX or -271NX or the -272NX

also, any updates on the following?
AND
ANE
ANF
ALH
ALM
ALN

Doesn't know about ALM, ALN is on weekly maintenance, as I heard, one A21N is near the hangar, one was at Apron Echo.

A321-27#N# is bit dangerous, Better to go with CFMI Leap 1A engine option, and also Better to consider LR version and also Business class configuration with 1-1 full lie flat seats just like Iberia's A321XLR cabins or Air Astana's A321N cabins. It will help UL to maintain long haul routes even in off-seasons instead of A332s, and also to cater short-haul routes instead of using dated A320ceos..

you're absolutely correct about the problems around the GTF(271/272) since it's still a relatively new design
but then, I also heard of problems around the LEAP as well, specifically in IndiGo's A321Ns.
A321 is the closest you might get to a B757(which is a medium-long haul narrowbody), and I see airlines like EXS replace their 757s with 321NXs
considering that the XLR started delivering in Oct 30th and having a significant backlog, UL might not be able to get their hands on one in the near future, rather by 2030 or later.
or they could go by dry-leasing A321N/LRs from other airlines(if that's economically correct to do and if airlines agree to lease them)
(I still have some questions about A321s serving lower passenger demand routes instead of A320s, or did you mean UL retiring the 320CEO and retain the 320NEO?)

I was refering of current A320ceo retirement (around 2026-2028) and as a replacement, A321N LR is better option, even the pax number is lower, UL can utilise for Cargo...
However A321N XLR is bit dangerous to operate for UL and not suitable for UL's network, since its a much new aircraft, Design flaws can be there and lease amount is high, Cargo space is not enough (UL does the cargo business and makes profit), Aircraft delivery can be delayed (Backlog is huge),, instead UL should go as i stated earlier in the thread.

For the short term fleet : UL needs to get A330-300s (-343 RR772B powered, less than 12 years old, on 6 year lease) for long and medium haul operations and also with a cabin overhaul (Lie flat seats 1-2-1 for business, 2-4-2 reclining for Economy), and A320-200s(either -214WL or -232WL powered, less than 12 years old, in 6 years lease) with good cabins.

For the long term fleet : UL needs to get (at least 12 jets) A330-900s (-941, with the same cabins, Lie flat seats 1-2-1 for business, 2-4-2 reclining for Economy in total 297pax) and (at least 10 jets) A321neo (s) instead of A320neos ( -251N/NX 12 lie flat business and good seats with Economy). These aircrafts should join with UL by at least 2028.

Final word is What ever the aircraft model, should be easy to get, lower maintenance, bit younger (like 4R-ABT, ABS) and with a good cabin (consistent hard product) ; )​

Do you think that if UL would hypothetically pick up an A350 (ULR or Normal) that they would be able to expand their operations to North America? such as YYZ, JFK, YUL etc? I don't think the A339 is sufficient to serve those routes (due to the limited range). Correct me If I am wrong but pilots who fly the A330 family can easily transition to the A350s, but the issue comes with maintenance such as high costs and more training (like you said).

I think UL's older jets will be going through a cabin refurbishment (eventually) after the restructure begins soon.. But will have to wait and see.