About the lack of tickets... If you collect all the artifacts you'll get a free ride back tot he starting point, so you only need enough tickets to collect all the cargo - you'll get more tickets after that.
It would be useful though if you could see every conection in advanced, so you could plan your route more carefully, not to come to a city near the destination you want to be at, only to discover you need to go half way across the continent again.
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