Long, Good time to buy at low price per share before 2020!

I analyzed in AAL's financial statement, balance sheet that showed me Before March 2018, Share was high per price. Then after March 2018, it went bearish price because AAL company had spent on expenses to improve financial in balance sheet in a future also increase assets from the more airports 777-300 also new built airplane large size for AAL company in Ronald Reagan Washington National Airport (DCA). that why price went bearish after March 2018, so I believe that would be increase price from new cashflow, also increase customers rate after 2021. What do you think?