In the wake of this weeks bidding for concessions to privately manage four of the nations airports, many reporters asked the National Airport Commission why Santiago and Herrera airports were not included in the bidding. Commission President Rafael Serrano Bank explained yesterday that while studies about the future of each have been concluded, no final decisions have been because of sticky problems with each. In the case of Santiago, the central government is trying to reach a consensus with Santiago leaders about whether to simply remodel the airport or to enlarge it. As for Herrera, the problem is that area around it has grown so much, it is obvious that the airport will have to eventually be moved.