The gas station and convenience store used by many visitors to Pittsburgh International Airport will be remodeled with some upgrades next month.VIDEO: Watch the report from the airportSunoco A-Plus will be closed from April 6 to May 20 for some big changes that will include a new deli and cafe that serves ready-to-order food.New gas dispensers will be installed, as well as charging stations for electric vehicles.Airport officials recommend that travelers who rent vehicles visit nearby gas stations on University Boulevard or Steubenville Pike to refuel before returning their cars to the airport. Gas can also be purchased from rental car agencies in advance.