Elemental Travels is the name of one of the Elemental Explorer base lists, and Traveler is another. I don't have any inside information but I would not be surprised if Elemental Traveler was an earlier name of the Elemental Explorer profession before they settled on Elemental Explorer.
On the other hand, F&I has TP costs for Elemental Traveler instead of Arcane Elementalist (except Air Mage lists Elemental Explorer and not either of the other two, which seems to support the earlier theory).