We're flying out of MRS on a Sunday morning (9:30AM). Have never been to this airport and don't have any idea how big or busy it is, so I'm wondering if anyone can advise us as to how early we should get to the airport in order to clear security, etc. Thanks!
It's small compared to Charles de Gaulle. But smaller also means a smaller staff to deal with security, check-ins etc. Take the advice of your airline. It's also a fair distance outside the centre of the city so you might want to look into the transportation schedules. The airport's useful Internet site is http://www.marseille-airport.com/
There's shuttle bus from the Marseilles train station that starts running at 4:30 am and every 20 minutes at least.