1) CTA transports 2) South African golfer 3) US Open 1994 and 1997 winner 4) US open champ ernie 5) US open golf champion ernie 6) US Open winner 7) US Open winner in 1997 8) US Open winner of 1994 9) Above ground trains 10) Above-ground transit 11) Aboveground transporters 12) Aerial RRs 13) African hero Found on https://www.crosswordclues.com/clue/els