Oh yeah MapleStory, just started it today. Real fun, I enjoy it. Already at level 23 and almost to level 24. I do recall seeing somebody have some sort of flying mech. It was only out for a few seconds though. Nothing like the one in the picture.
Well that's likely because it was merely a mount(Maple Story equivalent of Link's Horse) with a Cash-shop cover to look like a robot or one of the Gachapon "Rider" skills(same as a mount, except time limited). The Mech in that picture? Not even released in the Korean Version of Maple Story yet(the two guys behind the mech are currently in the game), but they hit the "Main" KMS server on the 12th(currently only in the test server).
Also, What server do you play on? I've got 8 characters(hurr hurr i'm an idiot who paid for more characters lots and crap) on the Mardia Server and, technically, i've been playing for upwards of Two years(granted there was a long gap from when i started to when i seriously began playing due to the grind being completely INSANE back then without Party Quests or the Astaroth Quest chain) and i've only got a single character up to level 51(Dual Blade class, made him quite litterally last Thursday) while the rest are 45(Page Warrior), 45(Brawler Pirate and the first character i ever got to level 45), 31(Gunslinger Pirate), 27(Aran), 26(Cygnus Knight NightWalker), 40(Evan), and 15(Bandit-path Rogue). Yes i do like to randomly rant about this kind of stuff i'm kind of weird like that.