And he needs to take flying lessons first, I guess.
Which reminds me that they forgot about essential parts in Begins and TDK. He spent like 7 years in Ninja training, but how did he become expert in flying with his batwings? It's not something you should or could teach yourself, I guess.
Lets not forget Wayne's playboy image - fast cars, fast women, why not get into fast jets? He could by a vintage fighter Jet (e.g the F-86 or if he could keep in South Africa say a Buccaneer) and use that as a cover to take flying lessons.