Hi, I'm looking for a bit of clarity on my booking class. I've booked a flight going from Muscat to Mel with Oman doing the first leg, and MH doing the second with a long weekend in between where I'm meeting some friends in KL.

I know on some fares Malaysian allows a change of flights without fee, or an earlier flight if seats are available. I'm wondering if that facility exists for booking class D (which I gather is discounted business)? It's booked via Oman Air and I didn't really have an option to choose another booking class.