For aerial wargaming I have been using 1/600 scale models. For putting them on the table, I had used some homemade stands. Consisting of a hexagon shape base plate, with small vertical rod. On top of the rod was a colored bead, with a magnet glued on. On the base was a rectangle for a 7mm D6 dice. (see image below) I have used these for several games, and they work fine. But have the downside, that everything needed to be noted with dice. The speed, height and often an ID marker, to check which unit it was. (with flights of multiple identical planes). So a better way to do this had to be found.
After ordering the new planes, it was time to order some new magnets to base the planes. When looking on the magnet seller site, I noted some long thin magnets. And a new idea sprang into my head. I have seen people using Lego bricks to denote the different height levels. But it might be also possible to do this with magnets. And you can see the results below.
I am very happy with how the finished result looks like. I am still thinking to add a dice frame, for the speed. But will probably play a game first. I hope this helps others too. Now I can proceed on basing the planes, and painting more.