Flying Dallas → Istanbul at the front of the plane
Booked well, Dallas to Istanbul in First Class is not an indulgence so much as arithmetic: a flat bed out of Dallas/Fort Worth International Airport (DFW), hours of genuine sleep, and a first day in Istanbul you don't lose to recovery.
From Dallas, the marquee product on this route is British Airways First — british club-room comfort with the broadest First Class network across the Atlantic. Depending on your dates, British Airways, Lufthansa, Emirates and Qatar Airways all present compelling options, each with a distinct suite and service style.
DFW is home to American's Flagship lounge with Flagship First dining — among the finest premium dining rooms at any US airport — available to qualifying First Class travelers on American and select partners, including Qantas. Emirates, British Airways, and Lufthansa First passengers enjoy elevated lounge access in the international terminal before departure.
On timing: april and May — tulip season, fittingly, since the flower came from here — and September through early November are ideal: warm light on the water, comfortable sightseeing, and full ferry schedules. July and August are hot and heavily touristed at the major sites. Winter has a moody, tea-and-ferries appeal and the best fares of the year, though pack for rain and real cold.