Very simple answer. Kenyatta family. Those deals were signed when Wanjohi was finance minister.
The deals eat a big chunk of KQ revenues , In short here is the break down
Taking example of last financial year
KQ generated 129 Billion Shillings in revenue
Lease of A/C charges is around 82 Billion KSHS
Fuel Costs around 33 Billion KSHS
Suppliers paid 20 Billion KSHS
Salaries take up around 12 Billion
Total around 147 Billion KSHS out of 129 Billion KSHS generated
The lease charges are around roughly at minimum Twice the market rate i.e. in KQs case the correct lease charges should be around 40 Billion meaning KQ would still be profitable company ( would have made a profit of 22 Billion KSHS) Instead its the Leasing companies (Tsavo+Amboseli+Samburu taking away 40 Billion )
Tsavo+Amboseli+Samburu are offshore companies and no one knows their directors - They are what are called special purpose vehicles - Where Owners of such companies take loan in this case from standard charter and Afro Exim , guarantee the loan (one has to have big money) then buy the A/Cs using loan money in this case ERJ Jets + Boeing 787 & Boeing T37 NG) then lease the A/Cs to airlines at exuberant fees ( in KQ case twice as much the market price ) , The company makes its money by being paid monthly lease fees pay the loan and pocket the change ( Big Money)
Now who are the directors /owners of Tsavo+Amboseli+Samburu ???