You never know...
...Orlando flights TEND to be busy... if you travel at peak times, it is not uncommon for them to be overbooked.
IF you have a free day after getting back, you could always "volunteer" for a bump at check-in or the gate area.... Just ask how busy the flight is, if the agent says "busy", then say that you are not in a rush to get home that night, so if they need some volunteers to let you know... the agent should put a note in your records and will call you if they need volunteers. Having willing volunteers often suits airlines - it is easier than going through looking for people willing to be bumped.
Sometimes this has even been known to get the volunteer upgarded (i.e. the flight is full in economy, but had spaces in PE - the agent will sometimes just pick that polite, willing volunteer who just spoke nicely to them....)
Of course, sometimes things just turn out - even on busy routes that look oversold - that there are enough seats for all passengers that check-in.
Just a thought...
Boo