The 'Chase Trifecta' strategy, involving the Chase Freedom Flex, Chase Freedom Unlimited, and Chase Sapphire Reserve/Preferred cards, is presented as a highly effective method for maximizing rewards and achieving free travel.
"when you want free travel this is pretty much as good as it gets to start it all begins with the Chase Freedom Flex which offers 5% cash back on revolving categories up to $1,500 these points all accumulate in the chase portal from where you could eventually apply for the Chase Freedom unlimited this is another completely free card that's almost identical to the flex except you'll be able to get 5% unlimited cash back through purchases made on the rewards portal and you'll get 1 and 1/2% cash back on all their purchases this gives you a higher Redemption rate than just using the flex card alone and when you combine that with the Chase Sapphire Reserve or preferred you'll be able to unlock the ultimate benefit of way more money back"