the Skypass is for 3-8 UA flight numbers (can be more than one segment if it is the same flight number) in North-America (includes US, Canada, Mexico, Puerto Rico). No mileage restrictions, only two transboarder flights, only 1 stopover per place, must be in connection with a transatlantic ticket and started using it in 30 days after transatlantic flight. Only for Non-North-American based costumers.