Goodevening gentlemen,
There are actually several intercontinental flights to be flown under class 6. For example (one which i have flown once) EHM-6901 (and the respective return-flight EHM-6900). An 8 hour crossing from LZSH to KBOS. For sure there are more, just be creative with the timetable!
Also in other directions there are possibilities under class 6. What about Atlanta to Buenos Aires? Also class 6, check out EHM-6903 (and the return EHM-6930). But be prepared for a long ride: 6903 took me 9.5 hours, and the return 6930 little over 10.5!! No problem for the (Level-D) B767-300, she can take it.
Good fun though for rainy weekends

Have fun and enjoy!
Stef
EHM-1242