On wide bodies
Aircraft performance improved improved flight range flights. Passengers now all face long day or night flights and jet lag.
Sleep in flight becomes the top issue to arrive fit and start leisusure or business journey instead of looking for a bed.
Keep Economy passengers seated and comfortable is essantial, but wjthout good sleep flights becme a torture.
Mark up for LESAT sleep mode is a daily revenue. For instance with 50 € on two rotations a daly and 330 days a year increase in ancillary revenue per equipped seat with 33.000 € per year.
On single aisle aircraft.
Flight range increase on B737 MAX and A321 NEO or XLR are becoming long and extra long range aircraf most competitive for transatlantic and transcontinental flights,
A Premium Economy Low Cost class with sleep comfort from 30 inch pitch and up can be installed with a small investment on existing seats and cabin layout.
As pitch is unchanged, passenger cost is remains identic but ancillary revenue blows up.
Investment pay-back is below two months.