You may have heard about StarNet Blocking where United blocks award seats on Star Alliance partners that are otherwise available for booking. I noticed that United.com seems to be blocking revenue flights on United metal and instead predominantly shows flights on CO and US. As a concrete example, I was looking for flights from SFO to ATL on April 28th. When you do a search on United.com for flights, it shows 15 possible routings, only 3 of which are on UA metal. The other 12 are CO or US routings. Same search on United.com using awards shows 15 possible routings, all on UA metal. Looking at seat maps, the flights look wide open. Going over to CO.com, you get 25 possible routings, 14 of which are on UA metal (either UA flight numbers or CO codesharing on UA metal). I know I can probably revert to the old FT trick of doing a multi-city booking, but what a pain. What's worse is that the United's routing gets reflected on my companies travel website so it too only shows 3 possible UA metal routings. What kind of whacky accounting scheme is being used where United.com thinks it is more profitable to sell seats on CO or US than on UA planes?