If you take 2 boards make sure you pack them together really well- possibly so they only look like one board ... I took my kite gear in one bag (marked Golf) and my surfboard (6'6") as well in another normal surfboard bag and f..kin' United Airlines charged me us$85 excess for having A surfboard every time I checked in anywhere with them (I went to the Carribean and Hawaii)- one time this bitch at check-in in Orlando (FL) asked what was in the golf bag - checked it and then wanted to charge me another us$85 when she saw I had a kite-board as well (so that's a total of us$170 !!!)- I just spat the dummy at her and called for the manager !!! It was 'Thanksgiving' and they still didn't want to give me a break...
Also many of these 'no frills' airlines (connecting flights to small islands etc...) will charge us$50 + if you have a surfboard with ya ... be prepared for this rip-off **** they are doing ...
Avoid United what ever you can do(no meals given even on 5~6hr + flights across the mainland, not to mention the geritric flight attendants) and check with whoever you do book with about their excess baggage, surfboard and change dates policy ... United also charged us$75 every time I had to change dates and another ****ing us$80 I think it was, for changing a date to a frid/sat or sunday departure ! ... nitemare - NEVER again ...

cheers,
Buzz
PS: Also flights in American territories - you are not allowed to lock your bags - if they are locked and they want to check them they reserve the right to break the lock so they can have a look inside (happened to my mate - when he arrived in Puerto Rico the lock on his surfboard bag had been cut off and placed in an envelope explaining they had been rummaging thru his stuff !) U.S. homeland security reserve the right to check your gear WITHOUT you being present (after you've checked in you have to carry your check-in bags to a special X-ray area and leave them with them) ... if that's not a intrusion into basic rights i don't know what is !!! Get ready for a nitemare travelling thru U.S. airports - the whole check-in & security procedures drive you nuts after a while ...