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"Planear" is a transitive verb which is often translated as "to plan", and "planificar" is a transitive verb which is also often translated as "to plan". Learn more about the difference between "planear" and "planificar" below.
planear(
plah
-
neh
-
ahr
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
1. (to arrange)
a. to plan 
Estamos planeando una fiesta de sorpresa para su cumpleaños.We're planning a surprise party for her birthday.
Tenemos planeado ir a la playa en agosto.We're planning to go to the beach in August.
An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
2. (aviation)
a. to glide 
La inercia mantuvo el avión planeando sobre la pista.Inertia kept the plane gliding over the runway.
a. to soar 
Solté hilo y vi planear la cometa en el cielo.I let go of some string and watched the kite soar into the sky.
planificar(
plah
-
nee
-
fee
-
kahr
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).