Once i booked two seperate tickets (for 9 people,6 people in 1 ticket and another 3 in another ticket) in SL class in 14115 express and the status was cnf1,cnf2... to waiting 7 before chart preparation but upon chart preparation the second ticket(3 passengers) got upgraded to 3rd ac and in the first ticket 5 seats got confirmed and 1 remained waitlisted...i mean the ticket which had more waiting got upgraded and the ticket with less waiting reamined partially confirmed with 1 seat in waiting..