Airborne network is a new sort of Ad hoc network, in which the nodes move fleetly and the topology changes rapidly. We describe a dynamic TDMA protocol for airborne networks. It can support unicast and broadcast synchronously, and use the RTS/CTS control packet to solve the hidden terminal problem. The new protocol divides  the frame into two parts: the contention slots in the front and the data slots in the back. Every node uses the control minislots to contend the corresponding data slot to send a packet. At the same time it can apply for the idle or failing slots, and use the eliminate packet to solve the potential deadlock. Consequently, it will realize efficient bandwidth utilization. Finally, we used QualNet to simulate the new dynamic TDMA protocol and testify the superior performance of the new protocol.