The Mid-2012 MacBook Air (11-inch and 13-inch) introduced significant upgrades, including Ivy Bridge Intel Core i5/i7 processors, faster USB 3.0 ports, 720p FaceTime cameras, and the MagSafe 2 power connector. Known for its ultra-thin aluminum wedge design, it features 4GB-8GB RAM (soldered), fast SSD storage, and Intel HD Graphics 4000. 

Key Features & Specifications (Mid-2012 Model):

• Processor: 1.8GHz or 2.0GHz dual-core Intel Core i5 or i7 (Ivy Bridge).
• Memory: 4GB or 8GB of 1600MHz DDR3L SDRAM (non-upgradable).
• Storage: 64GB, 128GB, 256GB, or 512GB flash storage.
• Display: 11.6" (1366x768) or 13.3" (1440x900) LED-backlit glossy widescreen.
• Graphics: Intel HD Graphics 4000 (integrated).
• Ports: 2x USB 3.0, 1x Thunderbolt, MagSafe 2 power port, 3.5mm headphone jack. The 13-inch model includes an SDXC card slot.
• Wireless: 802.11n Wi-Fi and Bluetooth 4.0.
• Battery: ~5 hours (11-inch) to ~7 hours (13-inch) of wireless web usage. 

Main Improvements over 2011 Model:

• Speed: USB 3.0 ports, which are significantly faster than USB 2.0.
• Camera: Upgraded from VGA to 720p FaceTime HD.
• Performance: Ivy Bridge processors offered improved speed and integrated graphics performance.
• Power: Thinner MagSafe 2 charger. 

The 2012 MacBook Air was highly regarded for its performance, maintaining the signature lightweight, portable form factor while offering enough power for daily tasks, including moderate video editing.