Declension table of ?vimānatva

Neuter	Singular	Dual	Plural
Nominative	vimānatvam	vimānatve	vimānatvāni
Vocative	vimānatva	vimānatve	vimānatvāni
Accusative	vimānatvam	vimānatve	vimānatvāni
Instrumental	vimānatvena	vimānatvābhyām	vimānatvaiḥ
Dative	vimānatvāya	vimānatvābhyām	vimānatvebhyaḥ
Ablative	vimānatvāt	vimānatvābhyām	vimānatvebhyaḥ
Genitive	vimānatvasya	vimānatvayoḥ	vimānatvānām
Locative	vimānatve	vimānatvayoḥ	vimānatveṣu

Compound vimānatva -

Adverb -vimānatvam -vimānatvāt