- "seats measure up to 18-inches wide in economy, the same standard configuration found on Airbus widebody aircraft"

- "To minimise cabin pressure effects on the body, the cabin maintains a 6,000-feet average altitude pressure, roughly equivalent to that of a mountain ski town. This is the same cabin pressure as the modern A350 widebody, and it helps to reduce physical fatigue, headaches and jet lag."

- "Modern next-generation LED lighting systems aboard the A321XLR gently transition through customised hues, mimicking natural sunrises and sunsets to help reset the body’s circadian rhythm. Temperature control is split into three actively controlled zones, and airlines can even opt for heated floor panels to give passengers an extra touch of cozy luxury. Last but not least, advanced acoustic technologies have been integrated through the aircraft’s frame to minimise engine noise, resulting in a 50% noise footprint reduction compared to previous-generation single-aisle aircraft."

1) The windows are disappointing. This is, I think, due to the fatigue caused by large rectangular windows that previously caused a disaster but it begs for improvement. A way to make large windows or get rid of all the windows and use very high definition screens to imitate windows with live footage would be nicer

2) Noise is still a problem. I am sure they are trying hard, even the engines are designed around addressing the noise issue but it would be a huge improvement to have this solved. ANC maybe?

3) Automate the pilot out. This is I believe an area where plane makers are pioneers but we still got pilots, I would love to see flying with a plane becoming about the same as taking an elevator.

IMHO travel times are reasonable, the improvements in comfort, cost and practicality are due. Airports themselves too are due for an overhaul, it shouldn't be taking hours to get on a travel machine.