The ipad air2 is thinner than the air3, with a thickness of only 6.1 mm. The iPad air2 is lighter. The iPad air2 has a 9.7-inch screen with a resolution of 2048x1536. The air3 has a local gold style.
More experience and evaluation of iPad Air2 : https://www.apple.com.cn/air2
More experience and evaluation of iPad Air3: https://www.apple.com.cn/air3
The ipad air2 processor uses the A8X processor that is more advanced than the iPhone6, and the ipad air3 uses the "monster" 14nm standard A9X processor, which has more powerful processing capabilities, while reducing power consumption and extending the battery life of the device.
Camera: Air3 upgraded to 8 million pixels, iSight rear camera with f/2.4 aperture, which is not as good as the 8 million pixels, f/2.2 aperture camera of iPhone5S, let alone iPhone6 and 6Plus in terms of cameras. Improved. However, compared to the original Air2's 500-pixel, f/2.4 aperture camera, this still represents an upgrade.