What a gorgeous baby dove!! And I'd say that the little thing looks really comfy and safe in your hubby's hand. So you don't need a pet taxi - he'll just have to hold him all the time and be the new mommy!!
He actually looks pretty old (all his feathers) - and if he was learning to fly, he should be able to eat fine on his own. He would have been fending for himself soon.
You've gotten good advice. Not sure if I'd try the pet taxi or just putting him back in the nest. But he's so cute. And how sweet of you guys to rescue him!!