[ken]

The MBA has Thunderbolt 3 ports good for "up to 40 Gb/s", so all you need is an external box to convert that to 10gig ethernet. Sonnet sells one: it weighs 3 lbs, has a 60W power adapter, and costs $500. It's the perfect accessory for your 2.75lb, 30W, $999 laptop!

[rsynnott]

A 1.3GB drive would still saturate a 10Gbit link.

Fortunately, there’s this: https://store.atto.com/order?ipa=211 at a mere 2000$

[Marsymars]

Those have been slowly coming down in price. You can get a bus-powered TB3 10G Ethernet adapter for $150 now.