NEWARK, N.J. ( TheStreet) -- Twenty-five years ago Wednesday, Continental's move to Terminal C at Newark Airport marked the start of a new life for an old airport, which went from being the New York region's No. 3 airport to being its biggest hub. Today United ( UAL), which merged with Continental in 2010, offers more than 400 daily Newark departures to more than 150 destinations. United is celebrating a departure to Denver at 6:15 a.m. on May 22, 1988, the first flight from Terminal C. Aviation consultant Bob Mann said United wants to remind people of its presence before Friday, when Delta ( DAL) celebrates the opening of its new $1.4 billion terminal at John F. Kennedy International Airport. At one time, JFK was home to Pan Am and TWA and had the vast majority of New York's international flights. LaGuardia was dominated by Eastern and Newark was home to People Express. The balance between airports began to change with the 1988 move, which was overseen by Bruce Nobles, then senior vice president of customer service for Continental. "The operation was much smoother in the new terminal," recalled Nobles, now a Dallas aviation consultant. "The move allowed Continental to significantly increase the size of its operation in Newark and to challenge JFK and LaGuardia as significant New York airports. "Terminal C was a well-designed new terminal with better baggage systems, better automation for the agents' terminals, more gates and more lounge space and (much shorter) walking distances," Nobles said. "The move allowed us to build up the hub activity." In 1986, Continental, then run by Frank Lorenzo, had acquired People Express. The acquisition meant that "all of a sudden, Continental had 200 daily departures from Newark," recalled Bob McAdoo, who was chief financial officer of People Express. People Express operated a hub, connecting 20% to 30% of its passengers, some of whom flew to Europe on Boeing 747s. The carrier, which began in 1981 -- McAdoo was the third employee -- had been based in Newark Airport's north terminal. The airport had started work on new terminal A, B and C in the late 1960s, but abandoned work on C, after finishing the shell of the building, because of a lack of potential occupants. Then People Express "started growing like crazy," McAdoo recalled. "We were running out of space. We signed up for them to finish Terminal C, but before it was complete Continental bought People Express and when C opened it was for Continental.