C) The New Generation of Civil Planes

Das erste Wort, keine Artikel/Präpositionen
Also:
The New Generation of Civil Planes

Unless of course your text is some fancy sort of print, where nothing is caps or whatever

Ist das so richtig:

A New Generation of Civil Aeroplanes – Linked with Land Expropriation

Ist das so richtig:

A New Generation of Civil Aeroplanes – Linked with Land Expropriation

Ich würde sagen: Das erste Wort natürlich, alle Substantive, Verben, Adjektive und Adverben.

aber heute mit künstlerischer Freiheit kann man schreiben wie man will

You're good, but I would spell it AIRplane(s). BE speakers may differ.

yes, BE: aeroplanes.

nur ein kleiner tip: das program "word" erkennt Überschriften und kringelt fasche groß/kleinschreibung als Grammatikfehler an (natürlich muss die sprache auf englisch gestellt werden)

On Next-Generation Non-military Aircraft - a How-to Guide to Taking Off.

I think the above example gets in most of the rules given in the Chicago Manual of Style.

This is a tricky question that has plagued editors, journalists and translators since time immemorial :-) The answer is that there are several answers - as many as there are style manuals, basically. The AP Style Guide would have you capitalize every single new word, regardless of its length and function in the headline. so, A) in your question.

In my experience, the above would be the most common usage, i.e. do not capitalize of because it is too short and not an operative word.

In Am English: The New Generation Of Civil Planes
In Br English: The new generation of civil planes

If you look st an American newspaper, the headlines are mostly in capitals. See http://www.nytimes.com/ for a typicsal example today:

High Court Re-enters Abortion Debate With Emotional Case

A British newspaper would have:
High Court re-enters abortion debate with emotional case

Typical example of headline from The Times (British English - few capital letters)
BBC strikes could lead to news blackout

The capitalization in headlines was our very first topic at this year's ILC.

I'll just quote my notes...

In title, capitalize all words _but_:

- prepositions
- articles
- co-ordinating conjunctions
- "to" of an infinitive.