Lavatory systems having containment compartments

A method of forming a lavatory system within an internal cabin of a vehicle, the method comprising:

• providing a containment compartment common to a first lavatory unit and a second lavatory unit that is adjacent to the first lavatory unit, wherein the first lavatory unit comprises a first toilet, and wherein the second lavatory unit comprises a second toilet,
• wherein the containment compartment comprises:
• a first interior end wall within the first lavatory unit;
• a front wall;
• a rear wall;
• a base;
• an upper counter;
• a second interior end wall opposite from the first interior end wall, wherein the second interior end wall is within the second lavatory unit, wherein the first interior end wall, the front wall, the rear wall, the base, the upper counter, and the second interior end wall define a containment chamber of the containment compartment;
• and
• an access door within one of the first lavatory unit or the second lavatory unit, wherein the access door extends substantially along an entire height of the front wall, wherein the access door is moveable between an open position and a closed position, wherein the containment compartment is exposed when the access door is in the open position, and wherein the containment compartment is closed when the access door is in the closed position.

A vehicle comprising:

• an internal cabin;
• and
• a lavatory system within the internal cabin, the lavatory system comprising:
• a first lavatory unit comprising a first toilet and a first sink;
• a second lavatory adjacent to the first lavatory unit, wherein the second lavatory comprises a second toilet and a second sink;
• a divider wall separating the first lavatory unit from the second lavatory unit;
• a containment compartment common to the first lavatory unit and the second lavatory unit, wherein the containment compartment extends through the divider wall, wherein the containment compartment comprises:
• a first interior end wall within the first lavatory unit;
• a front wall;
• a rear wall;
• a base;
• an upper counter;
• a second interior end wall opposite from the first interior end wall, wherein the second interior end wall is within the second lavatory unit, wherein the first interior end wall, the front wall, the rear wall, the base, the upper counter, and the second interior end wall define a containment chamber of the containment compartment;
• and
• an access door within one of the first lavatory unit or the second lavatory unit, wherein the access door extends substantially along an entire height of the front wall, wherein the access door is moveable between an open position and a closed position, wherein the containment compartment is exposed when the access door is in the open position, and wherein the containment compartment is closed when the access door is in the closed position;
• a first trash opening in the first lavatory unit, wherein the first trash opening leads to a containment chamber of the containment compartment;
• a second trash opening in the second lavatory unit, wherein the second trash opening leads to the containment chamber of the containment compartment;
• and
• a trash container stored within the containment compartment.