https://fighterjetsworld.com/air/the-story-of-the-sr-71-blackbird-that-outran-north-korea-sa-2-sams-missiles-flying-over-korean-demilitarized-zone/13658/

1. Take off from Kadena AFB, Okinawa, Japan then climb to 25,000 feet/Mach 0.9 before meeting up with the first Tanker at Mach 0.7, 20 minutes away.

Once done, climb/accelerate to 71,000 feet/Mach 3.0 then cruise climb at 200 feet/minute heading North...

2. Do a pass -first of three- over the Korean DMZ heading West to East, then turn South to begin to descend/decelerate down the East side of Korea to meet up with the second & final Tanker...

Once refueled, head back up the West side of Korea as before for a second pass over the DMZ from West to East...

3. Once over the Korean Coastline to the East, turn around 180 degrees for the final pass over the DMZ heading East to West.

Due to a SAM launch, accelerate towards Mach 3.5 with a 500 feet/minute climb and turn off track to the left heading into South Korea - keep climbing providing speed continues to increase. 

4. Once back over the South Korean Coastline, head back to land at Kadena AFB.

Tips:

*Most take off's were with 40,000 Ibs of fuel (1/2 a tank).

*Brake release to 78,000 feet/Mach 3.0 took less than 14 minutes.

*Air to air refueling took about 15 minutes...

*A typical descend/deceleration from 78,000 feet at Mach 3.0 down to 25,000 feet/Mach 0.9 took about 9 minutes.

The distance covered was 165NM. The Tanker would be 40NM ahead.