Altiplano; high planes.
because they didn't have planes
Celestina is a name that has Spanish origins. The name means heavenly or from the celestial planes. The name is quite rare and not as popular as it used to be in the 18th century.
some kind of spanish
'Do you have plans for tonight/this evening?'
In transportation vehicles that have Spanish names. They travel like everybody else. Cars, planes, trains, etc.
Ud tiene planes para esta noche?
It depends if you mean private planes or commercial or passenger planes. For passenger planes I think Air Canada would probably buy planes though I am not sure and I am sure there would be others.
Stealth-if you mean invisible to radar.I didn't know that planes could be invisible.I've never heard of any invisible planes.
Tienes planes para el fin de semana (informal) Tiene planes para el fin de semana (formal)
If you mean the geometric flat surface, you say "plano." If you mean the kind that takes off from airports, you say "avión."
Cuales son sus planes para hoy? --> formal version Cuales son tus planes para hoy? --> non-formal version