Post Covid - this has become a bit of a dance for me at the airport. Where before I would stuff two boards into one bag along with clothes and stuff for the trip and hope the zippers held - now its become a balance of weight and size. I figure I have had many year of not paying extra or paying just for an extra piece of luggage (suitcase cost) that I take two separate board bags and still hope for the best.
Get a Porter at the airport with a trolley - they help cutting lines, getting to friendly counter staff, etc.
On packing I make hard cardboard caps lined with bubble wrap for both the nose n tails of my boards - rear of the board gets one layer of bubble wrap.
Hope that helps 😀🤙