SpannerWanker 
4K
N125SY, N945SW
United Express (operated by SkyWest and/or Mesa Airlines)
E75L (Embraer ERJ-175) and CRJ2 (Bombardier CRJ-200)
PSP/KPSP
Embraer (left), Bombardier (right) Embraer ERJ-175 (left), Bombardier CRJ-200 (right)
Both aircraft are operated for United’s regional feeder network and are typical sights at US airports. CRJ-200s are being retired gradually, making ramp shots like these a bit less common as time goes on.