Hi: I'll be arriving in terminal 3 on Delta at 10:30 AM, then transferring to terminal 1 for a flight to Catania, Sicily. My choices are flights at 12:30 or 2:30 on Alitalia (on a separate ticket). What are the chances we'll make the 12:30 flight? I will have checked luggage that I will need to check in to Alitalia -- can that be done at a transit point or will we have to leave the secure area to check our bags? Thanks.