Without advancing air power, the Second World War looks more like the First

What would the Second World War look like if air power had not advanced beyond First World War capability?

It would look more like the First World War because armies would lack fast, long-range aerial fire support and interdiction.

Mature air power functions as artillery that can be summoned over long distances and redirected quickly. Freezing aircraft at First World War capability would remove much of that flexible striking power from the next conflict. Armies would find it harder to concentrate fire against moving targets, interdict routes, or exploit rapidly changing opportunities beyond gun range. The resulting campaigns would therefore resemble the slower and more localized battlefield systems of the First World War.