A Hong Kong-based fuel supplier has sued the grounded Jet Airways over a US$1.1 million bill it said has not been paid, despite repeated demands.Documents filed to the High Court on Thursday showed India’s oldest private carrier had agreed in April 2018 to buy aviation jet fuel from Sinopec (Hong Kong) Aviation Company.Sinopec began fuel delivery on March 1, but the agreement fell through in less than a month as the supplier’s lawyers claimed Jet Airways had defaulted on payment and ignored…