My experience has been that United will give you full EQM's for your original routing when there is a delay (mechanical or weather) or when you are voluntary/involuntary bumped. I have never missed a flight because of my error, such as not getting to the airport in time, etc...so I'm not sure what they would do in a situation where the customer is at fault.
Originally Posted by drtravix
United will (depending on what agent you get) credit your account for the miles ticketed rather than flown if you ask - but I'm not sure if those are EQM's that get credited, or just general non-flight CSR adjustment miles. Other airlines may have different policies, but it would probably be worth asking if something like that happens to you.