Hi bekbek! There’s no reason having both cards should cause any problems. In terms of airfare, we usually, but not always, have more contracts for the Youth rates. It’s worth mentioning to your STA Travel advisor that you qualify for both.

You can find out the discounts for each card at myisic.com. Just put in what type of card you have and choose the country/city you want to find discounts in, and everything applicable for that card will come up.

Let me know if you have any additionaly questions! Cheers – Francesca cam@statravel.com