I get the same exact result using this code:
\begin{center}
\fbox{\includegraphics[]{aircraft_items/my_drawing.png}
}
\end{center}

\begin{center}
\fbox{\includegraphics[]{aircraft_items/diherdal_angle.png}
}
\end{center}

\usepackage{thesislipsum}

...

\tlipsum

:13734870 $ pdftk
bash: pdftk: command not found

\documentclass{article}
\usepackage{scrextend}
\begin{document}
\ifcsname KOMAScriptVersion\endcsname
  \KOMAScript
\else
  no \KOMAScript
\fi

\end{document}

\documentclass{article}
\usepackage{scrextend}
\begin{document}
\ifcsname KOMAClassName\endcsname
  \KOMAScript
\else
  no \KOMAScript
\fi
\end{document}

def f123():
    yield 1
    yield 2
    yield 3

for item in f123():
    print item

xmin = min( x for i,x in MyTwoDimensionalArray )

In [1]: def foo(a, b, c):
   ...:     return 'quack';
   ...:

In [2]: import inspect

In [3]: inspect.getargspec(foo)
Out[3]: ArgSpec(args=['a', 'b', 'c'], varargs=None, keywords=None, defaults=None)

def expecting():
    """Return how many values the caller is expecting"""
    f = inspect.currentframe()
    f = f.f_back.f_back
    c = f.f_code
    i = f.f_lasti
    bytecode = c.co_code
    instruction = ord(bytecode[i + 3])
    if instruction == dis.opmap['UNPACK_SEQUENCE']:
        howmany = ord(bytecode[i + 4])
        return howmany
    elif instruction == dis.opmap['POP_TOP']:
        return 0
    return 1

def f() : return 1,2

a = f() # should contain 1 and not (1,2)
a,b = f() # should be as is, a=1 and b=2

In [1]: def foo(*a):
   ...:     return len(a)
   ...:

In [2]: foo(1,2,3)
Out[2]: 3

In [3]: foo(1,2,3,4,5,6,7,8,9,1000)
Out[3]: 10

In [11]: type(a)
Out[11]: tuple