Provavelmente
Não sei se alguma vez vimos alguém entrar no Beco Diagonal por via aérea, mas vimos alguém sair por ar:
And then at last, by the combined force of their spells and the dragon’s brute strength, they had blasted their way out of the passage into the marble hallway. Goblins and wizards shrieked and ran for cover, and finally the dragon had room to stretch its wings: Turning its horned head toward the cool outside air it could smell beyond the entrance, it took off, and with Harry, Ron, and Hermione still clinging to its back, it forced its way through the metal doors, leaving them buckled and hanging from their hinges, as it staggered into Diagon Alley and launched itself into the sky.
—Harry Potter and the Deathly Hallows
Se Harry, Ron e Hermione pudessem voar em um dragão, isso pareceria indicar que não há nada que impeça a pessoa de entrar ou sair do Beco Diagonal.
Por que alguém não faria isso?
- Voar por Londres arrisca a exposição, especialmente durante o dia.
- Pode ser um pouco rude pousar no meio de pessoas fazendo suas compras.