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Transcending the capabilities of traditional architectures, metasurfaces offer nearlimitless control over the fundamental electromagnetic properties of wireless signals, presenting new opportunities for wireless communication. However, they also bring forth unprecedented security challenges, particularly for millimeter-wave and sub-THz wireless backhaul links employed for many critical functions, such as financial trading on Wall Street. In this article, we expose a new category of aerial ''MetaSurface-in-the-Middle'' attacks, wherein an adversary armed with an on-drone metasurface, MetaFly, can intercept wireless backhaul links with an almost imperceptible trace. Strikingly, such adversarial metasurfaces can be fabricated in minutes using standard office items like a foil sheet and a laminator. The attack is implemented and experimentally evaluated in both a large indoor atrium and outdoor rooftops in a large metropolitan area, demonstrating the adversary's ability to establish a secondary diffraction beam for eavesdropping while maintaining minimal impact on legitimate communication.