ELHI: Sharing a flight with a celebrity singer and having him croon hit Bollywood numbers over the in-flight announcement system may give many flyers an ultimate high, but don’t expect the Indian aviation regulator to cheer from the aisles.Five airhostesses of Jet Airways have been grounded for allowing playback artiste Sonu Nigam to sing from the plane’s address system. The in-flight concert took place during a chartered flight from Jodhpur to Mumbai on January 4.According to reports, all passengers on board knew each other and requested Nigam to sing. The singer obliged and sang two songs — Do pal ruka from Yash Raj Films’ Veer Zaara and Panchhi nadiya from Abhishek Bachchan’s launch movie, Refugee.When the passengers started singing with Nigam, he said: “Arrey wah, aap bhi gaatein hain. My God, saare singer hain (Wow, you all can sing too. Everyone’s a singer here).” Videos of the singer crooning in air were posted on social media by some flyers and went viral.