Wanna know the story behind it? I guarantee you hardly anyone with less than a UA Premier status was on those flights. Once a person has flown at least 30 segments on UA or its partners in one year or 30k miles, they become a Premier. One of the biggest perks is any flight under 500 miles counts in your miles bank as 500 miles. So lets say you live 20 minutes from LAX and about an hour from ONT, you want to go to SFO. You may drive to ONT anyway to do ONT-LAX-SFO because doing so will give you twice as many miles and cost about the same, if not less. When I first started, there were always 15 or so people on any given ONT flight going on to LAX. But United caught on and considered this "cheating the system" which is part of the reason the flights are gone.