Flyer, maybe better to say it was possible in the past, but maybe not as easy any more. See the datapoints in this and the MBNA Alaska Airlines MC thread. MBNA had once been one of the most easiest to do multiple concurrent churns, but in the past year they have been much more 'iffy'.

I had 3 Alaska cards at one time in the past, and the most recent time that I had 2 concurrent BWR cards was a year ago. But based on MBNA's clandestine actions during our recent card apps, I'm now proactively closing down my MBNA cards before re-applying for a new one.

If you try to get a concurrent MBNA card nowadays, it might still work, but I'd say it's a lot more YMMV these days. I'm sure I will be proven wrong with a recent datapoint, but would more than welcome the "stuff it" replies.