I will speculate a bit about what a hypothetical 15" MacBook Air would be like.

First weight. I note these weights for existing models:

13" MacBook Air: 1.32 kg

13" MacBook Pro: 2.04 kg

15" MacBook Pro: 2.54 kg

The 13" MBA is 720 grams lighter than the 13" MBP. The 13" MBA is 35.3% lighter than the 13" MBP. Subtracting 720 grams from the 15" MBP leaves 1.82 kg. Subtracting 35.3% from the 15" MBP leaves 1.64 kg. So, a 15" MBA should weigh between 1.64 and 1.82 kg, which is substantially lighter than a 13" MBP. My guess is that a 15" MBA would probably weigh between 1.70 and 1.80 kg.

I note that the 11" and 13" models have the same thickness. I don't see any reason why a 15" MBA would need to be any thicker than the 11" and 13" MBAs.

The larger case would have better heat dissipation capacity than a 13" MBA and space for more battery. I believe a 25W CPU plus a discreet GPU would be possible in a 15" MBA.

There should also be room for an SDXC card slot.

I would like to see 4GB fixed RAM, the same flash drives as the current MBAs, and no rotating media.

First weight. I note these weights for existing models:

13" MacBook Air: 1.32 kg

13" MacBook Pro: 2.04 kg

15" MacBook Pro: 2.54 kg

The 13" MBA is 720 grams lighter than the 13" MBP. The 13" MBA is 35.3% lighter than the 13" MBP. Subtracting 720 grams from the 15" MBP leaves 1.82 kg. Subtracting 35.3% from the 15" MBP leaves 1.64 kg. So, a 15" MBA should weigh between 1.64 and 1.82 kg, which is substantially lighter than a 13" MBP. My guess is that a 15" MBA would probably weigh between 1.70 and 1.80 kg.

I note that the 11" and 13" models have the same thickness. I don't see any reason why a 15" MBA would need to be any thicker than the 11" and 13" MBAs.

The larger case would have better heat dissipation capacity than a 13" MBA and space for more battery. I believe a 25W CPU plus a discreet GPU would be possible in a 15" MBA.

There should also be room for an SDXC card slot.

I would like to see 4GB fixed RAM, the same flash drives as the current MBAs, and no rotating media.

Mac user since August 1983.

Mac user since August 1983.