The Airport's Press Release
The operation will provide capacity for 196,000 lbs of cargo to be transported through the airport each week.
So that equates to about 11 Tonnes per flight and just under 89 Tonnes a week, times 52 weeks puts that at just over 4,600 Tonnes per year.
The 737 can carry about 20 Tonnes, so the press release is saying half the capacity on the flight for Teesside.