this is a modpack i made for fun
but let me give a bit of a tutorial for a plane
first make a line out of any block you want
then assemble it (give it physics)
ad a propeller bearing upfront
use windmill sails as propellers
and a wool block directliy in front of the propeller bearing
i reccomend putting an inverted clutch behind the proppeller bearing
now power it with a creative motor
do not forget to assemble the proppeller bearing by right-clicking it with an open hand
now you have the base of a plane
you just need to add wing and flaps
also make sure the center of mass is right (check it using F3+b and search for a yellow cube)