If you own an aircraft you need staff that takes care of it. These get hired automatically after some time (if you don’t transfer out the aircraft immediately).
You will have to transfer some money to the holding or you will loose your group.
You buy an aircraft fully with cash (no leasing, no loan) with your daughter company. Then use the asset transfer tool and transfer it for free to the holding. In the holding, sell the aircraft back to your daughter using the asset transfer tool.
Repeat until you have enough money in the holding.