13-inch M1 MacBook Air: 2.8 pounds (1.29 kg)
https://support.apple.com/en-us/111883
13-inch M5 MacBook Air: 2.7 pounds (1.23 kg)
https://support.apple.com/en-us/126320
Macbook airs are lighter because they are smaller and lack fans (and maybe for other reasons too) so it is not comparable, but it is one of the reasons I like fanless laptops (whatever cuts a bit the weight for mobility is welcome).
alt Hacker News
13-inch M5 MacBook Air: 2.7 pounds (1.23 kg)
https://support.apple.com/en-us/126320
Macbook airs are lighter because they are smaller and lack fans (and maybe for other reasons too) so it is not comparable, but it is one of the reasons I like fanless laptops (whatever cuts a bit the weight for mobility is welcome).