Garmin has launched its new aviator smartwatches, the D2 Air X15 and D2 Mach 2, aimed at pilots and active users. The D2 Air X15 features a 45mm stainless steel and fibre-reinforced polymer case, while the D2 Mach 2 comes in 47mm and 51mm models with titanium or DLC-coated bezels. Both offer 1.4-inch AMOLED displays, PlaneSync and avionics connectivity, advanced fligh…