That's almost correct. It's not all words starting with 'a', but words staring with a _stressed_ 'a', like "águila", "aula" and "hacha" that use "el" as an arti

That's almost correct. It's not all words starting with 'a', but words staring with a _stressed_ 'a', like "águila", "aula" and "hacha" that use "el" as an article, despite being feminine words. The reason is analogous to the use of "an" in English instead of the article "a".