Is it the same Minimum credit score needed for Bank Of America, Citi Bank and Amex? Which bank needs the highest score? Also, for instant approval online, is it just based on the Credit Score retrieved? If it is, what is the minimum credit score required for instant approval online?

Today, I received a letter from B of A for my approval for the Alaska Airlines Visa Signature. It gave me a score of 808 for Equifax.

Thanks in advance