To be fair I think most English speakers are unfamiliar with how to type most accents. But it appears to me that æ is available as long press "accented characte

To be fair I think most English speakers are unfamiliar with how to type most accents. But it appears to me that æ is available as long press "accented character" just like é and ë, also used in English, so they are equally reachable on mobile phone.