I would avoid RA - or Nepal Airlines or RNAC or whatever they like to call themselves nowadays - like a plague.  Sure you might save few dollars, but it ain't worth the risk. 

They might just bump you for no reason. 

And suppose you do get the ticket, you never know whether they cancel the flight or not. 

And then, even if they don't cancel the flight and you have your boarding pass, you will definitely be in for hours of delay.  

So why, pray why, do you want to fly that airline?