So, I'm very new to all this, and I recently bought an American Express credit card which will give me 30,000 miles to use. If I sign up for a different credit card which also offers me 30,000 miles, under which circumstances can I use all 60,000 miles towards the same flight, and under which circumstances do I have to use them separately? Can anyone suggest a compatible card to get which also offers a lot of miles that may be able to be combined with the 30,000 from my American Express card towards the same flight?
Thanks!