A large part of the 1:48 range is airfield work: wheel pads supplied with decals, locking chocks, technical steps in two to seven treads, perforated steel plank matting for taxi surfaces, stencils and masks for spraying concrete markings, tool chests and timber boards for a model stand. Beside those sit road barriers, blockades and small fittings for street scenes.
How to turn a handful of parts into a scene that reads clearly is set out below.
This is the home scale for aircraft in a display case, and the parts follow that. One distinct group here is what you would find on an apron: chocks under the wheels, locking pads, stands, steps up to an engine, tool chests, portable extinguishers and the steel matting that aircraft taxi across. Stencils and masks for spraying surface markings go with them - stand numbers, centre lines, warning stripes. None of this makes a diorama on its own, but it gives a model context: the aircraft stops being an exhibit and starts standing on a surface.
In an aviation scene, well-made concrete wins. Perforated plank, expansion joints, sealed cracks and black rubber streaks create an impression that two extra sets of steps add nothing to. Only once the surface is finished should you place the equipment, and keep it off the model's centreline so it does not sit under a wing.
Parts that touch the wheels go on at the very end, positioned to the model as it actually sits. An aircraft always shifts a little once it is pressed down onto its undercarriage, and a chock glued ahead of time then hangs half a millimetre in the air - which is exactly what the eye catches first.
Spray masks give markings the faded, worn-into-the-concrete look. Decals handle small texts and warning plates that no mask could be cut for. Together they work best: large areas by stencil, small lettering by decal.
An airfield scene takes very sparing treatment well: a piece of surface, the machine, two people by the cockpit. To go further, look at 1:72 diorama supplies - in the smaller scale a whole flight fits on one base.