Is there an easy list somewhere of fares that are upgradeable rather than the list of fares that AREN'T upgradeable on .bomb? The Wiki statement on fares that cost more than x fare is really confusing without knowing exactly which fares are upgradeable. How does one ever plug in "I want X fare" and know that X fare is upgradeable without checking against the list of non upgradeables? Or is it just Y or J that is available to upgrade using GPU?