You can request an upgrade during purchase. You cannot upgrade RAM and cannot economically upgrade flash storage post purchase.
My personal opinion is that current applications require at least an i5 processor, 8GB RAM and 500GB storage.
But it really all depends on 2 main factors:
1/ Intended use: browsing the Internet, using office apps, and exchanging E-mails really don't require more than the basic/standard configuration of processor and RAM; no need to upgrade for that. However, more storage is always better if you have lots of media (music, photos, video), and/or if you are backing-up other devices to your laptop, and/or if you have a large amount of data that you need to migrate from your previous laptop or desktop.
2/ Future proofing: if you're the type who keeps a laptop for more than 3 years, you'd better get a more powerful unit in terms of processor, RAM, and even storage, so that your unit will last you 5 years (perhaps more) and still be able to handle more powerful apps and softwares, and store more and more media since we are moving towards more and more media-rich contents in everything we handle today.
In summary, and this being just my personal opinion, the best basic option should be the i5/4/256.
The best upgraded option should be the i5/8/512 or if you can afford the difference or need the computing power: i7/8/512.
I contacted Apple Support about this. They stated that the newest MBA 11" seelling for $899.00 has ugradeable ram to 8 Gb and that it can be replaced by the owner unlike previous models that had soldered ram chips.
I promptly bought one but havent yet done the upgrade or opened the case. This is a model A1465 purchased 6/19
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I'll bet you my best pentalobe 5 screw driver that you're gonna be displeased when you look under the hood. Check the internals before you purchase any RAM module.
-First, it doesn't make sense that they would back-track on their design.
-Second, here's an extract from everymac.com:"The Apple MacBook Air "Core i5" 1.6 11-Inch (Early 2015/Broadwell) features a 14-nm "Broadwell ULT" 1.6 GHz Intel "Core i5" processor (5250U) with two independent processor "cores" on a single chip, a 3 MB shared level 3 cache, 4 GB of onboard 1600 MHz LPDDR3 SDRAM (which can be upgraded to 8 GB at the time of purchase, but cannot be upgraded later), 128 GB or 256 GB of PCIe-based flash storage, [...]."
-Third, check Step 7 of this teardown.
-In conclusion, IT'S NOT user upgradable. Keep us updated once you look under the hood.
I hear you. I read that myself before calling them. I did a lot of digging and had several conflicting reports for both versions. I mentioned that it was stated in several media write ups and he, should have gotten his name, stated it was the newer model than early 2015, since it is mid June I figured OK.. If, when I open it, I find it as you say I will not be a happy camper and will make it known and see how well their customer service is, in reality, when I ask for the 8Gb model for only the difference in price or a refund.. we will see.
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Waiting for your feedback them :)