See if you can find a EuroMini Forté. EuroMini is the Euro version of the ZiZZO brand we have in the USA, and the Forté is their heavy duty model. It is a bi-fold design with extra reinforcement plates and a steel fork instead of aluminum. Double walled wheels and wide-ish tires. (1.95")

Look elsewhere in this subforum to find my review on the Forté. I just love it.

The Marino model is the same, but with a louder color and corrosion-resistant hardware.

If budget is not a huge issue, a Tern Vektron would be nice, but I don't think you'd be allowed to take the battery back and forth by plane, unless it's a military plane and they have lighter restrictions on lithium batteries.

Quick-detaching bags on the head tube and rear rack on my ZiZZO Forté. You can see the reinforcement plates welded on below/in front of the hinge, below the main tube at the head tube, and at the junction of the main tube & seat tube.

You can see that the handle post / stem telescopes up for a more upright posture. The seat post is only long enough for you to get full leg extension with maybe a 32" inseam. You'd likely need a longer seatpost.

The bike is rated to carry 300 lbs, which would allow you to have some luggage too. The empty luggage shown adds probably 7 lbs.