- Crew carry-on vs. checked bags: Crews for European airlines seem to always check their bags at the ticket counter and wait at bag claim with all of the regular pax, while US airline crews never (ever) check their bags - they always have their carry-ons with them. Given how fluid airline crew staffing can be with delays, reroutings, etc., I'm surprised that checked bags don't pose more of a headache if a crew's plans change.
- Reservations/call centers: This isn't true for all European airlines, but at a glance, BA, SK, KL (all of which I'd consider pretty large EU carriers) don't operate 24 hour call centers, while all the US airlines (even NK!) do, by default. I'm a little surprised that with a global operation across time zones, the EU carriers can get away without having res agents available 24/7. I've definitely had my fair share of phone calls morning time in Europe trying to rebook a delayed/canceled flight with an agent from a US airline who's working in the US at 2 am his/her time.
- Exit row luggage & window shades: US airlines don't care if pax in exit rows put items under the seat in front of them, while it's a strict no-no on EU airlines. I consider both US and EU airlines to hold similarly high safety standards - so what makes that safe/acceptable in the US, but not in Europe? Similarly, EU airlines are much more deliberate about requiring window shades up for takeoff & landing, and I've never heard crews on US airlines comment one way or another.
- Ground crew outsourcing: EU airlines seem to by default outsource their ground staff in nearly all airports other than their major hubs and sometimes a few major outstations (e.g. JFK), while US airlines often have their own ground crew (above wing, anyway), even in smaller airports. I flew out of PVR a few weeks ago on DL, and noticed that the agents all had DL badges - can't imagine an EU airline having their own full ground staff in a station with 4-5 flights a day (max).
- Notably more comprehensive gate announcements: This one's minor and is maybe more a cultural difference than anything else, but the gate agents for US airlines always do a huge spiel before each flight about the boarding process, lines, zones, carry-on bags, checking at the gate, etc. Meanwhile, with European airlines, they might do a quick overview of the order of zones, and then it tends to be a bit of a free-for-all. Other times, they just start scanning boarding passes and pax just figure it out on their own. This one's not "good" or "bad," but it's certainly a pretty notable difference.
Apologies for the random set of thoughts, but I figured there'd be people more knowledgeable than me here on a.net that would have some insight to the above!