Cost savings through scale are difficult when planes are tied to separate maintenance schedules and pilots need to be taken out of the productive loop for three months for retraining.
On our standard Windows battery rundown test, in which we fix the display brightness and loop a video endlessly to exhaustion, the Surface Pro scored just three hours and 46 minutes, despite having a 42.5Wh battery a third larger than the 31.5Wh pack in the Surface RT.