DXB is symbol for Dubai International Airport
It makes sense, but I do not think there is a clear resale potential here...main reason is that the end user pool is very limited, and they can go for another alternatives in new gTLD spaces as well...
At the moment, dubai/flights is available for around 500/year..if someone wants really to develop (serious end user) this renewal will not deter them and they can go for it.
I feel DXB name is not going to be profitable as standard .flights renewal is not so low (around 40-60/year)