safety protocols, such as the mandatory face mask rule.News agency ANI reported on Thursday that Alliance Air, IndiGo and Air Asia have asked seven passengers to de-board the plane until now after the Directorate General of Civil Aviation (DGCA) issued rules in this regard.Also Read | Why India needs to look east at TaiwanThe DGCA had stated last week that passengers will be "de-boarded" from flights if they don't wear masks properly inside the aircraft or don't follow "Covid-19 appropriate behaviour".If a passenger violates protocol despite repeated warnings then the passenger will be treated as 'Unruly Passenger', the aviation regulator said."It has been noticed that some travellers undertaking air journey do not adhere to 'Covid-19.