When you are delayed overnight either because of your own mistakes or by United but who won't admit it, UA will give you a "pink" ticket with an 1-800 # on it where you can call to arrange a hotel with discount tickets. The last time this happened to me I was given a letter sized computer print out that specified an airport hotel (LAX in this case) with the discount price directly printed on it. However, I "reasoned" with the ticket counter manager (UA fault) until I got a printout for complimentary stay.