We're traveling from SF to Panama via Guadalajara and Mexico DF on Mexicana. Question about the Guadalajara Airport. We arrive at 4 am at Guadalajara and then have to wait until 7:30 am to take Mexicana flight to Mexico City. Are domestic and international terminals different buildings in Guadalajara? And secondly, are airport facilities even open at 4 am? I assume we have to go through immigration and then go to the domestic facility.