Much of my recent time has passed on aeroplanes, with intervening bits on buses, trains, taxis and dragging an embarrassing mound of luggage between them. Planes share a style of decor and organization which differs from other transport. They feel sanitized and ordered. Every passenger is given a matching set of plasticized provisions. Most things are white or the colours of the airline brand, with no other advertising or decoration. Staff are unusually uniformed. They don’t just offer drinks, but authoritatively ensure that nobody has their tray table down when landing, or their hand luggage not stored under the seat properly. They have a long ritual to explain the detail of safety procedures, as if planes were especially dangerous. All these things are unusual for transport. Why are they specific to planes? I can think of two possible reasons:

1. Planes were more recently expensive, high status transport. Thus they traditionally have more intensive service and a cleaner style, as those who are paying a lot already are willing to pay extra for.
2. Planes are more inclined to scare their guests than other forms of transport: flying is a popular phobia. An air of meticulous order might go a long way to reverse the fear induced by shuddering around in the air torrents. Especially as those in control are clearly more authoritative than you, casually commanding you to sit down or close your laptop. Obsession with safety procedures could be particularly useful for calming passengers, even if it should suggest that emergencies are more likely. Paranoia about safety matters that passengers don’t care about, such as whether their tray table bumps them, means that they can trust the airline employees to respond strongly at the hint of a real emergency. So they can remain calm as long as they can see the flight attendants are. If this theory were true, it could also explain the similarity to hospital decoration and behaviour.