Electric aircraft maker Archer Aviation (ACHR -4.20%) has seen some big ups and downs. Similar to Tesla (NASDAQ: TSLA), investors are fascinated by its innovation with electric vehicles and think its future air taxis have the potential to be a leader in the sky.In September 2021, Archer Aviation went public through a special purpose acquisition company (SPAC), otherwise known as a blank check company.If you'd invested $1,000 when Archer Aviation began trading, you'd have just $425 today. Here's why.SPAC-Lan ...