I think there might be a Sikh businessman partner/intrest , as a quick visit to the site of < http://customer.videcom.com/airsylhet/pickyourown.asp > reveals the Khanda and a name "Akal Air" so that justifies the reason why the Khanda is on the tailfin, and also if you read the comments on the airliners.net website, the a/c it's missing the paintscheme on it's other side so perhaps it's still in progress and maybe this aircraft in the airline's fleet will be named Akal Air & the rest carrying the name Air Sylhet ? that's my 2 cents..
cheers