Diamond $200 travel vouchers stackable?
 

Looking at the T&Cs it LOOKS like I can use up to three on same ticket. Is this correct?

Thanks in advance!

I don't think so, but there is probably an exception if you have more than one passenger on the same PNR. In that case, it would be one voucher per ticket and to this extent they would be transferable.

Not familiar with the Diamond travel vouchers but I know you can do this with other vouchers that have the same T&Cs (bump vouchers). You should be able to do it online if just you but if that fails you can definitely do this by calling in.

I have done this three times in the past 6 months combining bump vouchers (had a $1000 and then a separate $500 from the same trip, both in my name). One time1 with 2 passengers (me + fiancee) on a PNR and two times when it was just me on the PNR and had these three experiences as a DL Silver:

Me + Fiancee: Had to call to combine, wasn't able to combine online but no problem with manual rate desk
Just Me #1 : Was able to combine online
Just Me #2 : Had to call in to combine, wasn't able to combine online but no problem with manual rate desk

If you get too much push back from reps on combining then consider 2 one-way tickets (if price is the same as the round trip that is)!

However, with this approach, you pay two change fees if the trip is cancelled.

Check the 3 numbers after 006. 054 are the most restrictive with 064 and 068 more flexible for companions. I have always been able to use a voucher plus an unused ticket in the same transaction but 2 vouchers is more challenging. I also buy 2 one ways to maximize voucher usage.

If you are talking about the $200 voucher from the DM selection, yes I have stacked it with two other VDB vouchers on one ticket.