Not to rain on your parade, but don't you think you're putting the cart before the horse? First you have to get hired at either UPS or FedEx, then you have to survive until you're real senior. By then, who knows what the most senior lines will look like, or even if you would want to fly them, at that time. You might have met someone really nice in Brazil or Thailand, or anywhere else in the world, which would probably mean that you'd forsake the senior lines to fly to those places.