I guess you could call it an oxymoron, but oxymorons do exists. For example, UA, AA, and CO's service to Cuba is all "scheduled", but since they cannot fly "scheduled" flights between the US and Cuba, they are charter flights (and one has to receive special, easy to receive, permission to fly the flights). There is also another type of scheduled charter like Sun Country is doing to Laughlin, Nevada. Charter flights that are simply scheduled. While most of the seats are sold by travel companies, however, seats are availble to the general public.