Happened to us a couple of years ago. They changed one of our flights so we would miss the connection we needed to make. The airline didn't notify us, I just happened to notice the change on my own. Another good reason for flying in early.
All I ask is a tall ship and a star to steer her by; John Masefield
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015