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Compare Apple MacBook Air (11-inch, Mid 2011) vs. Apple MacBook Pro (15-inch, 2.53GHz, Mid 2009)

This is a side-by-side comparison of the specs of the MacBook Air (11-inch, Mid 2011) vs. the MacBook Pro (15-inch, 2.53GHz, Mid 2009). Differences are highlighted in yellow.
Item MacBook Air (11-inch, Mid 2011) MacBook Pro (15-inch, 2.53GHz, Mid 2009)
Item image Item image
Screen size 11.6" [x] 15.4" [x]
Release year 2009 [x]
Battery capacity 35Wh [x] 73Wh [x]
Weight 1.08kg [x] 2.49kg [x]
Resolution width 1366px [x] 1440px [x]
Resolution height 768px [x] 900px [x]
RAM interface Dual SODIMM slot [x]
Screen type TN [x]
Colour Silver [x]
Key travel Unknown [x]
PWM detected? Unknown [x]
RAM speed 1066MHz [x]
Width 30cm [x] 36.4cm [x]
Depth 19.2cm [x] 24.9cm [x]
Pixel density 8ppi [x]
RAM 4GB [x]
Number of USB 2 ports 2 [x]
Aspect ratio 16:9 [x] 16:10 [x]
Number of FireWire 800 ports 1 [x]
Physical escape key? Yes [x]
Backlit? Yes [x]
Kensington lock slot? Yes [x]
Function row style Physical keys [x]
Newest compatible operating system OS X El Capitan 10.11.6 [x]
Touch screen? No [x]
NFC? No [x]
Supports Coreboot? No [x]
Touch bar? No [x]
Removable battery? No [x]
Fingerprint reader? No [x]
RAM specification DDR3 [x]
Keyboard style Chiclet (Island keys) [x]
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