Can I daisy-chain Thunderbolt 4 devices on a MacBook Air?

Yes, but you’re limited by the hardware. The MacBook Air has only two Thunderbolt/USB4 ports that share bandwidth with each other and display output. Each port can theoretically chain up to six devices, but you’ll hit performance bottlenecks quickly—especially with storage drives or multiple displays, since each port has only 40 Gbps total. For serious multi-device setups, use a Thunderbolt 4 hub or dock instead.