The landing strip theory is basically dead in the water if you actually look at the ground conditions - the soil there would have swallowed anything with wheels instantly, it's not compacted runway material. Von Daniken did a lot of damage to serious research on these sites by making it all so cartoonishly extraterrestrial that proper archaeologists refused to touch it for decades.
That said I don't think we fully understand what they were FOR. The processional route hypothesis makes more sense to me, ritual walking, astronomical alignment stuff. There's decent evidence for water cult connections too given how obsessed Nazca culture was with drought and irrigation.
What gets me is the sheer scale. You only appreciate the lines properly from altitude, which raises its own questions about intent without needing to invoke alien pilots. Who were they making this for if not something above them? Doesn't have to be spacecraft to be genuinely strange.
Anyone here looked at Anthony Aveni's work on this? Curious what people think of his ceremonial pathway interpretation.