The Lithuanian nationals were subjected to checks on arrival, the Defense Ministry said.
The Spartan also brought donor stem cells to Lithuania for transplantation. The military aircraft will be disinfected to be able to carry out other tasks. Its crew wore protective suits during the flight, according to the ministry.
Poland denies entry to passenger cars with Lithuanian license plates, but allows buses and minibuses to transit through its territory in an organized convoy.
The Lithuanian Foreign Ministry has said that drivers of passenger cars will have to return to Lithuania from Germany by ferry and their passengers will have to travel home by train.