Don’t need to be a tech expert to tell the difference.
2016-2019 4 USB c ports, oled touchbar, space grey.
2015 sd card reader, hdmi, usb a port. No Touch Bar.
So this is one that I have mixed feelings about - I'm on my way to my second million miles, and writing this literally on an airplane on my non-2015 MBP.
First, yeah, don't put them in checked baggage. In-flight fires are a huge risk - as is damage and theft. I wouldn't ever check one anyway. Completely agree with that ban, and agree that banning all models is the easier approach. It wouldn't surprise me to see a complete ban on anything with a lithium battery in checked luggage in the near future, especially if we actually have an incident.
As far as using them on board, that's a lot more nuanced. Flight attendants don't have the time to police that level of detail, and the training and precision required to understand the nuances, in addition to all their other duties, are probably excessive. That's true by the way, even if Apple did put model numbers on the case itself - on a widebody aircraft there may be dozens of people with Macs. So if you're going to prevent use, then a blanket ban is the most realistic option (wonder what they'll do with the 16" model about to come out).
But should they ban all use in flight? That's a tough one.
There's a lot more thermal energy in a laptop battery than in a phone, and there's no way to extinguish fires of lithium batteries given the current equipment certified for use in-flight. Between the fumes emitted and the fire itself, while it would be an extremely rare occurrence, but potentially catastrophic if it happened. That's why they completely banned hoverboards (even more energy than a laptop). On balance, I'd ban all vaping units completely (including carry on) first - fires are a lot more common for those, before banning Macs.
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I fully support banning all computers with lithium batteries from checked baggage, which probably represents all laptops and tablets with a non-removable battery. However, banning the use of those computers feels like an overreaction, especially when the use of less safe devices (cheap power banks, etc.) is permitted.
Good point on the power banks!