It's obvious that many people are unsatisfied with air travel. Airlines are looking to cut costs where ever possible so that they can survive, travelers are growing increasingly frustrated with what air travel in this day and age means, and airline employees, most of which are like the rest of us try to do their jobs as best as they can, end up bearing the brunt of this dissatisfaction.
My question is, "What one thing would you suggest airlines do to improve the quality of the travel experience." Let's try to keep it realistic based on the fact that airlines are private businesses and need to make money to survive (i.e. no suggestions like - make every seat a sleeper seat in economy). I think that there are many changes, most of which would cost very little money, but could go a long way toward bridging the gap between customer expectations and the business needs of the airlines.
I'll start this off by offering my suggestion - Be honest with your customers. If a flight is going to be 2 hours late, tell everyone to get lost for two hours. Don't keep changing the departure time in 15 minute intervals when the flight hasn't even arrived and the scheduled departure time is already upon us.