I've been issued an L-class ticket between Muscat, Oman, and Rapid City, SD. The routing is MCT-AMS-MSP-RAP-MSP-AMS-MCT. I had requested a connecting flight at MSP with a connecting time of at least 2 and a half hours. This was ignored. I have 1:40, which is impossible. The issuing agency says I'll have to pay 66 Omani rials (ca. US$170) to make the change. Secondly, I need a stop in MSP on the way back, but it looks like they're going to want extra money for that, too. My question is this: Would I be able to make this reservation change through Delta once I'm in the US? Or will I be referred back to the original issuing agency here? Thanks!