English is a dynamic language. If it weren't, it would be unpossible to introduce words like aircraft
So, somebody decides to pluralise the word by suffixing -s
? This may be a little annoying when you first read it, but it doesn't hurt anyone. The writer knows what they mean; you know what they mean; and the wasted energy due to typing an extra character and storing that information on a PC
This process is even less annoying than creating plurals with the -en
suffix. Aircrafts, sheeps, childs; it's all the same to me.