Can you use a iPad Air 2 with Apple Savings

No. The new Apple Savings Account is reliant upon the Apple Wallet App - to which your associated Apple Card must be added.

The Wallet App is only available for iPhone. As such, the benefit from the new savings account, you’ll need access to an iPhone:

Set up and use Savings in Apple Wallet - Apple Support

No. You need an iPhone to set it up and use. It cannot be accessed on any iPad.