Compression leggings v socks

leaving for our babymoon in a couple of weeks and I'll be 21 weeks then. taking a long haul flight. first leg 4 hrs with a 2hr layover and the final leg 16.5hrs!

I plan to buy the blanqi leggings and wear them on the flight. do you prefer wearing just that for a long haul flight, or just regular leggings/pants and have compression socks instead?

and if I do just wear the blanqi leggings, no need to have compression socks with me right? TIA! Ftm here!