opvliegers

Could you clarify what you mean by "opvliegers"? The term is ambiguous in Dutch and can refer to different things, and I want to ensure I provide an accurate, neutral wiki-style article under 300 words.

If you can specify the intended sense or context (for example, a technical term in aviation, a slang or regional usage, a brand or organization, or something else), I will draft a concise, neutral article accordingly.

If you’d like, I can also produce a provisional stub treating "opvliegers" as a general concept related to flying entities (people or devices) and refine it once you provide the context.