5% back to back savings - EXCEPT when one of the cruises is highly discounted such as a 2 for 1 combo then no back to back savings.

Free Air -- if both segements have free air and you take the $1000 off option then you get $2000 off.

If you take the free air it can be done as long as both trips have the free air special.

It gets messy if you want the free air special and only one sailing has that offer. Wont even go into it here but have managed to do it on occasion with some twists.