Getting from the high desert of Idaho to the Balkans requires patience and smart routing, since no carrier offers anything close to a direct path. The honest answer for anyone researching business class from Boise to Pristina is that you're looking at two connections minimum, with total journey time stretching well beyond the ~12.5 hours of actual flying once layovers are factored in. Delta, Lufthansa, and Turkish Airlines all serve this corridor in some fashion, and each offers a genuinely different experience once you're past the domestic leg out of BOI. My preferred routing funnels through a Delta domestic connection to a major hub like Minneapolis or Detroit, then transfers to a Lufthansa transatlantic flight into Frankfurt or Munich, where Lufthansa's business class (and increasingly the new Allegris cabin on select aircraft) offers proper lie-flat comfort and a real shower-equipped lounge experience in Frankfurt if you have the layover time.
Turkish Airlines presents the more interesting alternative, routing through Istanbul, which happens to be one of the best-positioned hubs for onward connections into the Balkans — Istanbul Airport's proximity to Pristina means shorter regional hops and Turkish's business class product, with its signature multi-course dining service, makes the long haul from the US genuinely enjoyable rather than merely tolerable. I've found that connecting through IST rather than a Western European hub often shaves meaningful time off the Pristina leg, since Turkish operates frequent regional service into PRN.
One insider tip: build in at least a two-hour buffer in Istanbul regardless of which terminal your connecting flight uses, as the airport's scale means even "short" connections can involve significant walking or shuttle transfers between concourses. Given how thin the schedules are on this route, fares can swing dramatically week to week — setting up automated fare alerts for the January-to-March and October-November windows, when European carriers typically discount business inventory, is the smartest way to catch this itinerary at its most reasonable.
