Right OR Left First

When we wanna enter a jetplane~ Which side of our feet that we should use FIRST to enter the jetplane~?? Right foot or Left foot~??

ENIAC

Did you know that ENIAC (Electronic Numerical Integrator And Computer) which’s considered as the first large-scale, electronic, digital computer capable of being reprogrammed to solve a full range of computing problems, is contained 17,468 vacuum tubes, 7,200 crystal diodes, 1,500 relays, 70,000 resistors, 10,000 capacitors and around 5 million hand-soldered joints?