I agree with what everyone told you...but dont know his symptoms walking or tremor problems mine is walking fly biz class book early for APEX FARES sit close to toilet to avoid "long walks" sit on aisle NOT BULKHEAD SEAT too confining pack meds in carryon NOT checked baggage carry perscriptions for everything. I must add that Ive run out of meds and have had NO PROBLEM getting some extras locally. Note the chemical compound name rather than brand. Are you travelling from New Zealand to the Carribean ???? WOW I think you have good beaches a lot closer....!!!! Having just gotten back from 3 weeks in Europe (from New Jersey) the most difficult part for me is traveling WEST and thereby screwing up my med schedule...Going east is not so bad. If his problems are in his legs and he needs a wheelchair...you can take yours along and deposit him right up a the aircraft door...then they have a 'BUDDY" seat just wide enough for the aisles to take him directly to his seat. They will put your chair in the closed on board so you have immediate access when deplaning. I have a three wheel electric scooter and it was carried NO CHARGE in the cargo hold. I did have to show them exactly what to do..even went to the cargo door to show them. THE DISSABILITIES ACT (here in America) PROHIBITS ANY AIRLINE TO CHARGE EXTRA REGARDLESS OF HOW HEAVY. Hope some of this helped Good luck Joyce