An airplane circumnavigates the globe by flying above the equator and at a constant altitude above sea level. If the plane repeats the journey but flies at an altitude which is 1000 m higher than before, how much larger a distance through the atmosphere does the plane travel as compared to the first time?
(a) 6.283 km
(b) 62.83 km
(c) 628.3 km
(d) 6283 km