Whats Shimano Flight Deck all about? There is a ribbon cable inside and what seems to be a button by the thumb of the shifter. What is it for? : r/bikewrench
Shimano Dura Ace ST-7700 STI Shifters: 9 Speed Double Non-Flightdeck EXC-NM - Bike Recyclery
Shimano Ultegra Shifter Left Front ST-6600 Flight Deck Double Combo Shift 10s 10 | eBay