For those quibbling about the Aminta's 'first', please note that each of the adjectives - the words highlighted in my re-posted text - is important:
Aminta Hennessy was the first Australian woman to fly solo across the Atlantic in a single-engine aircraft.
Some women record holders flew single engined aircraft aircraft across the Altantic, but they weren't Australian. Some Australian women record holders flew a long way in single engined aircraft, but not across the Atlantic.