I mentioned earlier the AA A321 doing transcontinental flights in the US. They carry just 102 passengers, no more (10F in a 1-1 flat bed config, 20C in a 2-2 flat bed config, and 72Y in a 3-3 config, of which 36 with extra leg room).
I don't know if AA did this on the basis of performance limitations of the A321 or other considerations. I was under the impression that this service was to replace a B767 service, with high frequencies and more premium.
Even if it were due to operational limitations, this would be because of prevailing Westerly winds on a East-West route as is the case on US transcons. At cruise flight levels, this is a constant 100-200km/hour wind.
See here for the charts of the day:
https://www.aviationweather.gov/windtemp
A North-South track such as BRU-Africa doesn't have this problem.
With the NEO, many African destinations would not have any range problems.
Comparing a 170 seat A321 against a 286 seat A333 brings a 7% margin of error as the A321 would have more premium seats than the A333. Still a long way to justify the old A333 over a pair of new A321 NEO.
40.000 pax per year carried between African cities... yes that will make a case for such an operation... How much revenue does that add? 100 euro's a piece, 4 million a year sounds about it. The secto.rs aren't that long.
What's the actual cost of the intra-African sectors? 20-25 millions a year pax even if we consider that 50% of the pax stay aboard until the second African stop?
How can you compensate for that, the fuel savings of the A321 NEO, the additional 20% of capacity and the additional availability for intra-EU, mid-haul?
-Lease costs? Yes, an old A333 is cheaper than 2 new A321 NEO's by about 300k euro/month but the availability for mid-haul and intra-EU offsets that completely.
-Crew costs? Partially offset by using augmented crews, thus avoiding hotel, transfers and per diems on both flight and cabin crews. The productivity is higher, average wages lower.
-Maintenance costs? I think that 2 A321 have the same maintenance costs as 1 A333 of the same age. So 2 new A321 NEO's will have significantly lower maintenance costs than an old A333. This adds to the advantage of the NEO's.
-Insurance costs? Too small to even include in this comparison
-Cargo revenue? It would be interesting to know what SN's average cargo revenue per A333 flight on Western Africa is. I'm sure that it's not as big as some here think it is, air freight prices from Africa are around 5-7$/kg retail, including handling and administration, so wholesale nett yields must be really much lower. I don't see a lot of freight to Africa going through BRU, as most of the air freight stuff that goes to Africa comes from Asia.
But even so, the A321 can carry pallets and containers, and plenty of them. Even with many pax taking 2 luggage, the A321 could guarrantee 1 or 2 pallet positions on each flight and limit itself to taking only the highest yield cargo, but with higher frequency, which is what really matters.
As I said before, if the yield was significant enough, it would justify operating dedicated narrowbody freighters. But I doubt that the yield would justify that, hence the A333's are burning extra fuel carrying low yield cargo.
For me this modus operandis with A333's is like a generator charging a battery that runs a motor, which powers the first generator. It's just an idle operation of additional costs compensated by additional revenues.
Other costs: the A321 NEO adds a level of flexibility to the operation that would see SN avoid millions in hotel accommodations, compensations to pax and wasted perishable cargo, Hifly wetleases whenever an airplane goes tech, as you reduce the risk by almost 50%. You can take an A321 out of their mid-haul and intra-EU duties to dedicate it temporarily to African operations whenever one of them or even an A333 goes tech in Africa or even BRU.
If tomorrow an A330 has major damage to it due to an incident/accident, it can cost SN tens of millions of euro's until they find a suitable replacement and add it to the fleet. Even if insurance cover the damage to the airplane, the operator has to absorb all the operating costs that arise from this.