Trying to spark an emotional connection in the commoditized airline market
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It is a hard issue to address, but if you tell your customers that you focus on issue X (prices in this case), don't be surprised when they respond in kind!
Now they've put so many restrictions on when and where you can redeem your points, how quickly you accrue them and when they expire altogether that it simply isn't worth sticking with a single airline to accrue points you can't use.
For the first ~30 years of my life I was nearly exclusively an United flyer (passed down from parents who traveled for business extensively and were based near an United hub), yet even I have realized that it's just a game of where I can get the lowest cost / highest roi now, since there's just no rewards for my loyalty.
So why would I pay substantially more for Business if I don't know what I'm getting? Might as well save the money and take unpaid leave or get a nicer hotel.
However as other responders mentioned, aircraft logistics are complicated. Unless you operate virtually identical aircraft (the Southwest, Ryanair etc model) then you need both pilots and cabin crew that are certified on the aircraft model. Plus you need appropriate maintenance staff, baggage handlers, gate staff etc.
It is just too complicated to pull off logistically. That isn't to say major airlines don't have the ability to respond on-demand. They do have spare aircraft around, and have ones that can be chartered. For example that is how sports team travel around the US.
Also be aware that airlines have a typical load factor (how many of the seats they sold on each flight) of around 85%. There isn't that much slack in the system. 25 years ago, load factors of 65% were considered the norm. These higher load factors are also why the frequent flyer programs are so much more stingy now - they have more paying customers to fill more seats.
United often mix larger 737s and smaller regional jets on the same route during the day. The complications arise when trying to slot them into other routes when otherwise idle; either they're too much aeroplane or not enough.
If they're fully amortised then you can just park them for the rest of the day, but crewing becomes an issue.
An extreme example is Lufthansa which is operating a daily mix of A321s ( ~200 seats ) and 747s between Frankfurt and Berlin this month to handle the ramp-up to Christmas.
On the distinctive side though there are other new-entrant carriers trying that strategy (Virgin, JetBlue) and mostly pulling it off (well, Virgin didn't make it in the US). In the US I prefer JetBlue when it's available, then Alaska/Virgin, and then Southwest. I'll pay a small amount more but know I'll get a reasonable product. I avoid the legacy carriers where the experience is both expensive and dire, even for international flight.
My experience: former Espace Bleu on AF, 100K on UA, Exec Platinum AA, Mosaic on JB. In other words, despite being considered one of the desirable passengers on UA and AA, service is so bad and so generic that I avoid them.
Long haul is a different story and it feels like there's still lots of space to differentiate.
I look back at these mementoes with fondness, and while I cannot actually remember the flights or the destinations any more, it does elicit a strong emotional tug towards that airline.
What will it cost an airline to give each kid that flies with them a set of metal or plastic wings? $1? Get that brand association and pride in early!
I mean it's not as if there's no precedent for that kind of behavior. The idea the airlines are entirely subject to the whims of consumer demand seem laughable at the surface.
Maybe phrased another way: What evidence do you have that this is what customers want?
Similarly, if users cared about quality then budget carriers would be dying rather than exploding in popularity.
The fact that coach seating fills up faster than first class? If the majority of people truly wanted comfort over cheap prices and lack of service, we should expect FC to be full on every flight, with airlines offering vouchers for downgrades.
RyanAir have been trying it [1], EasyJet to some extent [2]
[1] https://www.independent.ie/business/irish/michael-oleary-pla...
Now, if only they would fly to places I typically go...