You cannot sell your Buzzard as it is a pegasus vehicle and Pegasus vehicles cannot be sold.

Can you sell the buzzard in GTA?

Approach the aircraft. Enter the aircraft. Press the indicated button to modify it (Right on D-pad for PS4 users). Select "Sell" to sell the aircraft in GTA Online.

Can you sell helicopters in GTA 5?

You can only sell working planes that are in the hangars. Once you've settled on a plane, select it and press Sell. Helicopters are sold in the same way.