China stocks fall, banks and airlines weigh; Hong Kong down
* SSEC -1.2 pct, CSI300 -1.0 pct, HSI -0.4 pct * HK->Shanghai Connect daily quota used 2.7 pct, Shanghai->HK daily quota used -6.2 pct * FTSE China A50 -0.9 pct, BNY Mellon ADR China Select Index +0.1 pct SHANGHAI, April 20 (Reuters) - China stocks …