”Avioanele zboară din aeroporturi” should be considered a valid option too
Thanks again crbratu. Many times you have the answers that I search for.
I wish they told me that before I went to the bus stop to board my flight!
I guess this is related to 'volare', only the 'v' transmuted to 'zb'?
Apparently, by way of Vulgar Latin 'exvolare'. Italian and Romansch also have related words that begin with unusual consonant clusters.