The landing strip theory is pretty much dead from a serious archaeology standpoint, the ground is too soft to support any aircraft we know of and the lines themselves are only a few inches deep. Wouldn't hold up.
That said I do think theres something genuinely odd about the sheer scale of them. You don't need landing strips to still believe something unusual was going on there. The geoglyphs only make sense from altitude, and the Nazca people didn't have hot air balloons or anything like that as far as we know.
I lean more toward the ritual/water mapping theories these days but I'm curious what others think. Anyone been down there or looked into the newer research? I've read a bit about the Japanese team that's been using AI to map new figures and it raises more questions than it answers tbh.