Surely, it shouldn't be too difficult to answer the question, 'are north Atlantic Jetstream velocities on the increase? We should have at least of 50 years of upper air data, not to mention real time NAT position reports with wind/temps to research. But over a 46 years career in airline ops and flight planning, I look at the upper charts these day an do think that Jetstream velocities are in the increase, or at least the incidence of very strong Jetstream are.