Tasnam.........I would definitely use a different account. You may get lucky & collect the 25K a second time but more likely than not if you're using the same phone number & the same skymiles number it won't work. The worse part is that you'll think you're signed up for the bonus. If you call to check they'll say yes but the miles just won't show up in your account. I know because it happened to me. If you use a different airline you should be fine. However every time you call MCI you get a different story, so you never can be sure. Good luck.

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MilesNut