This will be specific to you but find your home, build up the miles, earn your rewards. For me, it’s United as Denver is one of it’s hubs. I get two free bags at 70 lbs each. Because of this, I typically bring a bag that is full of meeting supplies - printers, badges, easels, signs, you name it, I’ve got it, and it saves so much on shipping. Not to mention the additional leg room.