Luna: Take the airship in Junonpolis to Eucar, the main city after completing a quest after a certain level. Or pay Captain Ruven a small fee to take you there at any level.
Eldeon Take the airship in Junonpolis to Xita, the main city after a certain level.
Orlo: Complete a series of quests before you can take the portal in Oblivion Temple (not located within the main city), and arrive in the desolate middle of no where. You also need to do a series of quests before you can somewhat access the main city by foot.
What I suggest is that after you have completed the Fate quest and Orlean quests needed to reach Orlo, Alphonso in Junon should be able to transport you to the Gate of Muris. Oh, and we could use some Muris return scrolls too.
Also, carts are disabled on the first map of Orlo (can't remember the name), I'm guessing this is just something unintentional and has been overlooked.
Edited by Phish, 04 July 2011 - 07:14 PM.