https://www.chess.com/blog/airlinesguidess/how-to-quickly-reach-american-airlines-r-u-s-customer-care-full-guide
https://www.chess.com/blog/airlinesguidess/how-to-quickly-reach-united-airlines-r-u-s-customer-care-full-guide
https://www.chess.com/blog/airlinesguidess/how-to-quickly-reach-singapore-airlines-r-u-s-customer-care-full-guide
https://www.chess.com/blog/airlinesguidess/how-to-quickly-reach-delta-air-lines-r-u-s-customer-care-full-guide
https://www.chess.com/blog/airlinesguidess/how-to-quickly-reach-lufthansa-r-u-s-customer-care-full-guide