You know that the "Cactus" callsign used by US Airways was discontinued last month? Did you know that the US Airways callsign and US Airways three ICAO code were discontinued in 2008 and that they had been using the America West callsign and code for the last 7 years? Now, everything is merged into American Airlines as previously mentioned and the US Airways brand will live on in history books. Nothing to see here, move on.