The airline isn't doing this (making you wait) of its own volition, and the 4+ hours you were stuck on the ground are a nightmare for everybody on their side of the deal, too. In fact, if your flight had any chance to make money, that hold erased it just for what the extra cost of wages was (pilots and FAs are hourly employees -- most travellers assume they're salaried). I don't know what equipment you were on (it wasn't a 707 -- those antiques are hauling cargo around the third world, or being converted into pots and pans by scrap dealers). But assuming the usual domestic 737 with two pilots and four FAs the airline probably ate $12,000 in salary and bennies on your flight. You know what you paid for a ticket and how many people were on the plane -- now you see why United is financially paws up?
If the hold had been longer, it would have been worse (for you and the airline) because they would have had to call in another crew. Since fatigue has been cited as a causal factor in accidents, strict crew rest and duty hours rules have come into effect. If they call in a reserve crew, they wind up paying two crews... plus you have to wait while the reserve crew briefs-in on the flight. FAs can pretty much step into the position cold, but pilots have to know certain facts about the plane, the weather and the route before they go.
One thing the lines have done to make better on time stats, as these holds become longer and more frequent, is increase the "official" length of legs by anywhere from 15 minutes to an hour. People are more concerned about arriving when they are promised, than about how much time it takes to fly.
The one thing the captain might have done to make your long stay on the tarmac more palatable is to permit a beverage service. The problem with that is, if the controllers tell him "OK, roll" when the service is ongoing, he has to say, "stand by" while the FAs put the carts away, winkle out any pax who have gone into the lavatories, and get everybody (including the FAs) belted in again. If he's not ready to roll when the controller green-lights him, he may have to say, "unable," and then somebody else goes and he winds up, if he's unlucky, at the back of the queue again.
The bottom line is: more people flying, and paying less, means that flying will be more congested and more hassle. Most people buying airline tickets are bottom feeders price wise. Most people will not spend $50 extra for a direct flight, but they will bitch forever about the airline that "forces" them to change planes. Therefore, very few airlines try to sell service and those that do (Midwest Express, for one) usually go blooey.
The way I see this shaking out is with two or three big bankruptcies, and then the market settling on higher prices. I'm not suggesting airline execs are blameless for the bankruptcies, the majors (especially American and United) have been run by inept kleptocracies for years.
But a nightmare like you had could happen to pax on any line -- even the best run (in the USA, probably Southwest, still).
d.o.l.
Criminal Number 18F
You mention the ticket price; in this case we paid more than $500 for round trip from San Jose to Scranton PA. I don't call that a cheap price. And another thing, UA had NO FOOD on these flights. Well, they had some scummy looking "box lunch" on the flight from San Jose, at the price of $7.00. Not cheap. Crappy looking food. Fortunately I had anticipated that and brought sandwiches for us to eat. Coming back from O'Hare to SJO, NO FOOD available. Period. $500 round trip? For THAT kind of non-service, this was NOT a cheap flight.
All that, and service with a sneer. Lovely. Hell of a way to run an airline (run it out of existence, that is.)
Thank you for the very thorough reply, Criminal Number 18F. It boggles my mind when I consider the logistics of all the different airports, air crews, ground crews and employees, security, air traffic control and the hundred of thousands of passengers that fly daily--on a good weather day. Throw in bad weather in any part of the country and it's a nightmare. My husband flies with one of the airlines that some here wish a quick demise. Flippant comments by clueless people get to me sometimes. The last thing you (I) would want my pilot husband to do, is carry a plane-load of passengers into an unsafe sky. Yes, I get frustrated with delays when I fly and I do think communication is the key to happier passengers, however, some people will not be happy, no matter the reasons for delays.