I was searching for flights to Lithuania. You could make this about flights to Lithuania or you could make this about foreign airlines in general.
The first time I went to Europe was in 2007 for a Yiddish summer class in Vilnius but I didn't give myself time to see sights or museums. I bought my flights from Northwest, just before Northwest was merged with Delta and then the Northwest brand was discontinued. The second time I traveled on a plane, I bought tickets from Expedia because I was not wise enough but it worked good by accident. It was two different airlines but just one flight each way. I went to different parts of Europe 6 times and two other places outside Europe and at least 4 trips inside the United States. I bought all those flights from American or Delta. Lufthansa has a better flight than the flights I saw from American or Delta. I haven't finished researching flights. I had previously thought Delta and American had the best flights available and/or I thought I had to take flights from a USA based airline.
Have any of you taken Lufthansa from the United States to somewhere in Europe and back? Do you have loyalty to any specific airline or do you just randomly pick the same or a different airline as you took last time depending on whoever has the best flight? Is there any reason to limit myself to American or Delta, or would it be fine to let myself fly on a foreign-based airline?
Delta has a trip that will physically work but it takes longer and has 2 stops instead of the one stop from Lufthansa.
I already know which flights look best but I will keep searching for 2 weeks or more to make sure I don't find better flights.