For me, it was the vestiges of HP / America West "Cactus", memories of my friends René B. the HP FA and Kathy S. the US FA, (soon enough to be an AA FA as that bit gets implemented) and the few times I flew on US. The elimination of once-proud names of airlines (I flew many of them, from AirCal, Branniff, Eastern to Pan Am, PSA, TWA, Western to a lot in the middle), has become routine - but we all tend to mourn and reminisce about our predilection airlines.
As the US Airways brand and codes disappears, mostly October of this year, I'm seeing these grow.
NEWS: AA - US Res. System Merger Jul - Oct; US code / brand ends when over
Frequent Business Traveler:
Photo Essay: A Tribute to US Airways.
June 25, 2015, Brian Sumers posted "How Many Planes Have American Airlines and US Airways painted?"
here. His chart below.
Let's see what else comes about, and if you wish, share with us.