In an airplane, from whom are you most likely to acquire a cold or flu virus?

Actually in an Airplane no doubt its mainly from the water, food, co-passengers and airplane staff that we most likely to acquire a cold or flu virus, ie, it may happen in the form of drinking, eating, sneezing, breathing and contact of co passengers or airplane staff, who have already been severly affected, Hence they may spread it easily to the low immunity peoples.