Capital One has done more than any other issuer, I think, to improve the benefits across several cards but most especially the Venture card which has a 100,000 mile initial bonus offer right now. On top of other new benefits, Capital One introduced transfer of its miles to several airline programs at the end of 2018.
Now Capital One has introduced new airline transfer partners and improved the rate that mileage transfers to some of those programs, and provided new details on its forthcoming network of airline lounges and new travel booking portal.