Subject, object, complement, etc. in Japanese sentences. All require body language. If these components are not body language or sentences, formal body language "の" must be added after the predicate component to nominalize the predicate component.

For example, "private schools are reluctant."

"の" here represents the place where "Private がしてぃる" is the subject in the sentence.

The "の" in your question should also be an object (such as train, plane, car, etc.). ) Both sides understand this. Normal time can be:

もつとぃはなぃんですか? Is there no earlier flight? )