Ah interesting, I didn't know until now that you were applying speed stickers at runtime! I see that you provide a handy remote interface so I could likely fix this in Spidertron Enhancements. However, you should really be listening to the script_raised_built event and adding your sticker then as well.
My recommendation is to add the line [defines.events.script_raised_built] = on_built_entity, in lib.events, and change the line local entity = event.created_entity to local entity = event.created_entity or event.entity (because script_raised_built provides entity instead of created_entity).
This way, you'll be picking up aircraft from any mod that creates one with surface.create_entity{..., raise_built = true}.
(Fixed version here: https://drive.google.com/file/d/1XdaYIN82rCFrY-_h07pFw2k_JgfFqgxv/view)
