Debt Of Honor, what is the other?
Actually, both scenarios come from that book. Besides the JAL pilot suiciding into the Capitol Building at the end of the book, the two CIA agents use a powerful strobe light (I don't think it was a laser) to blind the flight crews of Japanese Air Defense Force AWACS during landings/takeoffs, thereby causing them to crash. They also the light weapon in the beginning of the book to help kill a Clancy equivalent of Somalia's Aidid.
Both are from Debt of Honor. Special Forces infiltrate Japan and bring down one of their 747's with a radar dome by shining a laser into the eyes of the pilots when it is landing.