Advanced air mobility (AAM) is expected to organize unmanned aerial vehicle (UAV) traffic into corridors at multiple altitudes. In this paper, we study the downlink (DL) and uplink (UL) capacity of a multi-layer Manhattan-grid corridor mesh served by a terrestrial fifth-generation (5G) new radio (NR) macro network. The corridor spacing and the numbers of layers, UAVs, and base stations are configurable. We combine the 3GPP aerial channel and antenna models, correlated UAV mobility, and frequency-selective fading with an NR physical-layer abstraction that includes channel aging and link adaptation. Results show that UAVs above 90 m experience a DL signal-to-interference-plus-noise ratio (SINR) about 17 dB below that of ground users, and that a dense macro network with $10^\circ$ downtilt leaves 17-29% of corridor positions without DL service under full-buffer load, regardless of corridor spacing. On a common layout, the carrier frequency (700 MHz, 3.5 GHz, or 7.2 GHz) changes the UAV SINR by less than 0.5 dB, since the corridor links are strongly interference-limited. The UL is the bottleneck: at 85% satisfaction, a 20 MHz carrier supports only about 3.4-4.1 UAVs/km$^2$ with 4 Mb/s of UL video per UAV.

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