Join Date: Aug 2002
Location: WAS/TYO
Programs: UA 1K, AA EXP (3MM), DL PM, BONVOY TITANIUM, HYATT GLOBALIST, HILTON DIAMOND, IHG DIAMOND AMB, et al
Posts: 6,234
I think it also has to do with the printers. Most of the check-in counters and ACs have been upgraded with newer printers, hence the lighter weight blue BPs. Many of the gate printers are still the older ones using the green stock. At least that's what I think it is.
-FlyerBeek