re: Worth it to get a Credit Card for air miles?

If you want quick points either AMex Plat or Chase Sapphire Reserve. Both offer 100k bonus after min spend and also have travel credits. CSR has a $300 credit for travel that auto credits your account after you spend. Both have high annual fees though. CSR is 450, not sure what amex plat is. Amex plat offers 5x pts for flights and CSR offers 3x points for travel including hotels uber flights etc. Just do some research on both. One of these cards is likely your best bet.