I’ve written extensively about the $395 annual fee Atmos™ Rewards Summit Visa Infinite ®  Credit Card , which I consider to be the most lucrative airline credit card out there . This card isn’t just for Alaska Airline loyalists. With partners like American Airlines and British Airways, Atmos Rewards points can be extremely useful for booking reward flights across any carriers. At the moment, the card is offering a massive limited time welcome bonus , which includes 100,000 Atmos Rewards points and a 25,000-point Global Companion Award after spending $6,500 within the first 90 days, plus a 50% flight discount after account opening. Admittedly we see lots of big welcome bonuses nowadays, so perhaps people are almost desensitized to this, and have a hard time getting excited, since six figure welcome bonuses are hardly out of the ordinary. However, let me explain as simply as possible why you should care about this bonus, and add this card to your wallet.…