Act as a seasoned travel consultant with over 10 years of experience in advising frequent flyers on optimizing their travel rewards. Provide a detailed comparison of the top [3] travel credit cards tailored for [frequent international travelers] who prioritize [airline loyalty programs]. Include key features such as sign-up bonuses, earning rates on flights and purchases, annual fees, airport lounge access, and global acceptance. Additionally, highlight any unique perks like companion tickets, travel insurance, or concierge services. Explain how each card aligns with different travel habits and budgets, and conclude with a recommendation for the best card based on the traveler’s [primary airline alliance] and [annual travel spend].