One more thing: I want management to invest as much as possible into streamlining the process of codesharing.
For example, I want the kiosks to work no matter who is operating the flights. If the first flight on a specific day's itinerary is booked as US but operated by UA, I want to be able to use either kiosk or either airline's web check-in. Also, if I happen to stand in the wrong check-in line (not realizing a flight is a codeshare), I don't want to be told I need to go wait yet again in another check-in line. Granted, as a frequent passenger, I probably won't make this mistake, but your average passenger who flies once or twice a year probably will.
I want airport signage to be crystal clear, for both regular passengers and elite customers. For example, when I checked-in at SFO to take a UA flight SFO-PDX, it was totally unclear which check-in line I was allowed to use as a US1. Also, in airports where one of the two carriers does not operate (e.g., PDX), some signage is needed for customers who buy a US ticket but are obviously flying UA, and vice versa.
I want upgrades I buy on UA to be electronic, and I would like to be able to queue myself up in advance. I don't need it to clear in advance (unless UA really wants to upgrade me), but it would be nice to have the upgrade queued. It would also be a nice touch if UA granted me some comp upgrades once a year and vice versa. Maybe a set of four included with each year's elite packets. Not asking for a free ride on UA when I don't fly them much, but it would be a nice touch nonetheless.
I want airport facilities to be coordinated. SEA is a good example of this with the recent move of US to the UA terminal.
Anyway, there are plenty more areas where investments should be made. My point is if UA-US-LH-etc. do this right, it can be a great benefit to all carriers.
Also, while we're on the topic, I also want US itself to invest as much as possible into streamlining my travel. I love the kiosks and web check-in. From my standpoint, really anything US can do to make sure the kiosk and web site function flawlessly and do everything I need them to do is a major plus. From simple things like changing a seat at the airport after using web check-in to more complicated things like flying standby on an earlier flight, it's all a matter of programming. Prime example: I book a regular weekday Shuttle ticket for, say, 5 p.m. I get to the airport at 3:30 and have time to make the 4 p.m. I want the kiosk to offer me the option of the 4 p.m. flight if the rules for my ticket allow. If the rules don't allow, I want to know the fare difference (taking into account any discount codes, goldfile numbers, etc. in the reservation). For more ideas, ride Amtrak one day and try their kiosks out!