Tired of paying £8 for a limp airport sandwich while you wait at the gate? Airport lounges offer an upgrade to your pre-flight experience, free food and drinks, comfortable seating, fast Wi-Fi, and a welcome escape from the terminal chaos. And the good news is, you don't need a business class ticket to get in. The right credit card can unlock the lounge door. But with so many options out there, knowing which card gives you what, and at what cost, isn't always clear. Different