We've watched ships leave Port Canaveral before. It can by almost like a convoy, but then somebody will be waiting for someone and break things up. I believe their must be minimum cliearance they try to maintain.
Last year we sailed in a small armada with ships from Carnival, Royal & Celebrity from Cabo San Lucas to Long Beach.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Alaska 2014 - haven't picked a cruise yet
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012
Celebrity: Summit 2011
Princess: Ruby 2010, Caribbean 2013
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
We have sailed out of San Juan three times when there were four ships, CCL, NCL, RCL and Princess embarking thirty minutes apart. It was fun to watch them sailing while waiting your turn. One time we were to have been first but the cpatain announced that we had some folks delayed at the airport so we waited for them and went third or fourth. We were sailing late in the evening (first ship to leave at 10 pm) under a full moon so it was quite a sight. [big sigh]