No COVID-19 till now has not been declared air bone but chances are there, as this virus affects directly our respiratory tract and can pass through mouth, nostrils , eyes etc. Mask is necessary and very essential as it protects you from the virus because it is not necessary that only droplets can lead to to corona. The virus has tendency to stay 11 hours on steel , 5-7 hours on plastic, clothes etc. so when you touch the infected area and then you mouth or face the virus reaches your respiratory tract and affects your body. So stay safe and take all precautions needed. ( Take this advice as I am going to be a doctor in the future so I get to know all the updates and everything about it)