I fly out of PHX which means most of my flights are on US on first leg. The issue is that a lot of times the US website will not present "competitive" routes that AA flys. For instance: for PHX-GEG US only lists their two direct flights and no AA flights but on the AA side it lists the direct US flights AND several other connecting options. Those connector's are MUCH MUCH cheaper than the direct. Or the only way sometimes to get somewhere now since they have cancelled some direct routes out of PHX in favor of connecting at the hot mess called Ohare or DFW. However booking these inevitably leads to a US metal first leg on AA ticket stock. Which of course means I don't have access to upgrades out at the Platinum time window on that first flight. This is a very common issue, in fact almost all of my recent flights have started on US and ended on AA with AA ticket stock, rendering my upgrade request down to a 24 hour with almost no hope status. Almost eliminating any upgrade advantage of being a preferred member. I will be very happy once the reservation systems are COMBINED, greatly relieving these common issues. I wonder if the brain trust in Dallas understood they are alienating a solid group of long standing supporters in their own hub cities. I bet CLT and PHL travelers are seeing similar problems with the combined AA route network now.