I should have said about abut San Diego Airport:
It is one of the best airports that I have been through. It is up to date, clean and well organised and sign posted. The rental drop off has a large multi-story for all and a VERY good shuttle to the terminals. The rental facility is on the North Side of the runway and the terminals on South Side, like many old airports, the city has grown up around them and squeezed expansion space.
When we got to the shuttle, there was a staffer helping those that needed to get on and lift their bags. On the bus the driver was then loading bags into the racks and would not let you do it yourself as it was a regulation! Both men were cheerful and polite. On the ten minute ride, the driver told us a few facts about the airport and how the only other single runway that has more rotations a day is LGW and then only by a margin. He also told some 'Dad jokes' which was OK. He helped us with the bags at the terminal and we were happy to tip him.
The terminal was VERY clean and great signposting. The Alaska check-in agent was also friendly. We were early but a comfortable area to eat a snack and watch the planes. The inbound was delayed by a very big storm at it's last port (SFO) and we departed about 45 mins late but, as mentioned, great service.
By comparison, the internal signposting at SFO a few days later was terrible and we were not the only ones trying to find our way around. When we got back to LHR T5 the next morning, we soon discovered that they have not fixed their staffing problem with bag handlers and had to wait much longer than expected, given it was the early afternoon and the terminal quiet. Passport queue was short.