Belfast flights are not being affected by the Ryanair pilots strike.
Bird claimed the worst problem on Sunday was lorries blocking the M40 which led to 55 minute delays.
But he added: “As long as you took it nice and steady people got where they were going to. We’ve not seen snow like for seven years so it is challenging for all of us.
A passenger plane, destined to Gachsaran on Saturday, returned to Tehran airport due to bad weather conditions as well as low visibility, Manager of Dogonbadan Airport, Ali Taheri, said on Saturday.