not racing around trying to shave 2 minutes off a flight!
Unless that means that you make it before closing time.
Espada, some of Jet2's fleet are old 300 clunkers that cruise around at .73ish.
BOAC, 620mph is only 540kts, not unheard of with a decent tailwind, granted it won't be quite as good on the way back. Assuming he's looking at GS!