hey hey live2ride
have you reserved the shared water taxi yet? check venicelink.com, they have shared at 25E minimum 2 people. read the information (you may to wait up to 45 minutes) to fill. don't know if they leave with two but you may meet someone around the airport area, F.te Nove (A or B) is a stop for you, don't know where your airbnb is, how close to stop, how far to push luggage over cobblestones, can you checkin early or drop bags off to hold. since 9am is arrival, add time to go through passport/customs, maybe someone in that line to share. my own opinion is this is one of the best and fastest way with taking the bus to train station then changing again to alilaguna. it's up to you what's more important, fastest , and cheapest (doesn't all go together sometimes). the BEST is to get a private taxi for 115E, eat deli sandwiches, cichetti and house wine, one less expensive meal, taking saving outta piggy bank, grin and bear it. no stress, start vacation with a smile, enjoy the magic of venice,
we have used the water taxi 3 times but we had 4 friends to divide cost. we booked with motoscafivenezia.it europeforvisitors.com has lots of info
aloha