For US residents we would recommend to apply to travel rewards credit card that will earn miles on all purchases (even when you purchase tickets form Etihad with this card). For example, consider applying to the Discover it® Miles. It gives you good 1.5 miles per dollar on all purchases and matches all miles at the end of the first year (provided you are a new cardmember), making them twice as many. Moreover, card do not charge annual and foreign transaction fees.
Disclaimer: This editorial content is not provided or commissioned by the credit card issuer(s). Opinions expressed here are the author's alone, not those of the credit card issuer(s), and have not been reviewed, approved or otherwise endorsed by the credit card issuer(s). Reasonable efforts are made to present accurate information, however all information is presented without warranty. Consult a card's issuing bank for the terms & conditions.
All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.