I am trying to help my daughter book ORD-ZAG with SJJ-ORD return in September. Turkish has the best price - but I ran into difficulties using their website to book. I wanted to enter her United info - but it kept erring out with invalid number. I then tried to leave it blank - but it wasn't happy about that either. So then I checked Amex travel and they priced the itinerary at $50 less than Turkish. Has anyone had experience with Amex? I'd like to save her money but not at the expense of her having an issue should any IRROPs occur during her trip or schedule changes/cancellations prior. I did check google travel - but they won't price out Turkish. They just send me to the Turkish site.