(a) whether the Government has fixed any time limit to replace older generation aircrafts and if so, the details thereof;
(b) whether older generation aircrafts of various companies are still in operation and if so, the airlines-wise details of the number of older generation aircrafts still in operation;
(c) whether the Government has taken any action against these airlines; and
(d) if so, the details thereof and if not, the reasons therefor?