FORT LAUDERDALE may become the homeport for Royal Caribbean International's two $1.2 billion, 5,400-passenger Genesis-class ships when they debut in 2009 and 2010. Port Everglades would have to undergo a $37 million expansion of Terminal 18 in order to accommodate the megaships and would ask Royal Caribbean to foot that cost, port spokeswoman Ellen Kennedy said. The port predicted that the ships' year-round presence at the port would create 3,800 jobs, producing total income of $172 million. Terminal 18 is currently being renovated to accommodate Royal Caribbean's 3,114-passenger Voyager of the Seas.