Window unit for an aircraft, aircraft having the window unit, and method for assembling the window unit

A window unit for an aircraft, the window unit comprising:

• a wall module having a side wall for laterally delimiting an aircraft cabin, said side wall having at least one window opening, said wall module having a plurality of retaining portions;
• a window module having a window frame for accommodating at least one windowpane, said window module having a plurality of fastening portions;
• a fastening configuration for fastening said window module on said side wall in a region of said at least one window opening, said fastening configuration being formed by a respective fastening portion engaging with a respective retaining portion;
• said retaining portions and said fastening portions being movable into a plug-in position by a plug-in movement of said window module and being movable from said plug-in position into a securing position by a rotary movement of said window module;
• and
• said wall module and said window module being connected to one another by a form-locking connection in said securing position.