Banks do not publish the credit score needed to be approved for specific cards, and approval is based on a variety of factors. (rewardexpert.com)
The highest end airline specific cards sometimes include access to that airline's lounges in airports around the world. (investmentzen.com)
I also earn double and triple miles / points on certain types of purchases such as food, dining, and travel so I use specific cards for specific purchases. (globalgirltravels.com)