I haven't flown with them but regardless of who, if it's your first plane trip with your SUP, use lots of padding/bubble wrap. I have damaged more boards while travelling overseas than I am while Supping. I keep my paddles separate and take 2 paddles and extra leg ropes, especially the thicker/stronger ones that are handy in big waves. I always get stung for extra weight fees regardless of the airline, but you can often prepurchase baggage allowance for sporting equipment (usually cheaper than paying when you check in). Bringing your roof straps can be helpful at times but the vans can usually just fit a 8.5 ft SUP inside. Ps. If you out two airport trolleys together, you can sit your board on top and your bags underneath. Then you won't need porters.

Hope it all goes well for you.

I bought Malindo flights last year. They ended up cancelling the flight and gave my money back 16 weeks later.