RileyDove,
...not fuel constraints as such..navigation constraints that still remain within our flight test limits.
Remember this was the first time the MRA4 had been let loose over the pond. Given a little bit more time there will be a sharp increase in range and versatility of the aircraft.
You take for granted the operating envelope of the MR2. All new aircraft have to be carefully extended through a prolonged test environment to ensure we safely approach the design limits of the aircraft (airframe and sensors). It doesn't happen overnight, but I can assure you it is gathering pace and before long the MR2 will look rather dated in comparison.
Can't wait to see you guys after a 14+ hour trip!