Taxiing is the correct spelling when referring to the movement of an aircraft on the ground under its own power.
Taxi Taxie was created in 1977.
The -ing form is waving.
You would spell value with -ing on the end as valuing.When you add -ing to a verb, and that verb has a silent E on the end, you get rid of the E.
Typing
riding
Tiering
eye ehn gee
Practicing
end ear ing
planning
centering
Picning