macbook air is the product name, unless you say it's the same thing as a macbook/macbook pro, in that case ALL macs are the same and "i", "book", "pro", and "air" are all modifiers.
therefore, according to some, the plural should be macsbook, macsbook pro, imacs (no change), macs pro, and the classic macsbook air....
or, in accordance to everyone else's argument, the entire name is the name, keeping eack product separate: macbooks, macbook pros, imacs, mac pros, macbook airs.
clearly the second example is more accurate.
therefore, according to some, the plural should be macsbook, macsbook pro, imacs (no change), macs pro, and the classic macsbook air....
or, in accordance to everyone else's argument, the entire name is the name, keeping eack product separate: macbooks, macbook pros, imacs, mac pros, macbook airs.
clearly the second example is more accurate.