If drones stop shutting down airports, the telcos see a major business. Verizon CEO Hans Vestberg promised at CES 2019, "Verizon is committed to being the first to connect 1 million drone flights on its 5G network." Saudi Telecom, KT, Vodafone, and KDDI are doing active testing and hope to go into commercial operation in 2019.
The number of drone flights will likely be limited until practical flight control is demonstrated. 5G (and most 4G) networks can easily handle the modest number of drones in the air if human control is needed. Military and civilian research into truly autonomous control of drones is active worldwide.
Turkcell is using a Huawei system in 3.5 GHz. Verizon is working with Ericsson in mmWave.