While tracking a couple of flights out of KSFB, GSM 826 shows up as an unknown owner. GSM is actually Globespan Airways of the U.K., also known as Flyglobespan. Callsign is “Globespan”, website is www.flyglobespan.com
Excel Airways’ (XLA) callsign is “Expo”, website is www.excelairways.com
Take care…