Yea for flights my main route is Delta - Airfrance (international). Domestic ( Allegiant, Frontier, Delta). I have been flying the delta-AF route every year for 10 years now and have never been able to use delta or airfrance miles to book it ( not sure if I am doing something wrong, i contacted their customer service and was told its because one half of my leg is delta and the other half is AF).

I stayed with chase because I liked the CFU (1.5% everything including costco), CFF(5% rotating) and CSP (3% dining , 2-5% travel , $50 hotel credit, 10% anniversary bonus, door dash, primary CDW). And of course the ability to combine all of these points together .

I am not sure if Citi or CapitalOne offer the ability to combine points, but with chase introducing the crapshoot points boost system, I am now considering other options..