just reflexively bought macbook air 11" should i keep it

[ecib]

I would NEVER give up an MBA for an iPad, even if I was just doing light web and emails, OS is too valuable for any daily routine tasks, imo.

Obviously. That was directed at the OP who also has a MBP. If he is just web surfing and checking email, he may not need to a)worry about 'daily routine' tasks, and b)can do said daily routine task on his other notebook. He doesn't necessarily need two of them.