AYA not yet, no longer / aún no (C) R consistently has a final glottal stop in this item. See AH-,YA. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 15.
Attestations from sources in English:
aya (adverb) = not yet, not now Daniel Garrison Brinton, Ancient Nahuatl Poetry: Containing the Nahuatl Text of XXVII Ancient Mexican Poems (1887), 150.