Leather used in aircraft must meet strict flammability and fire retardancy of leather (flame resistance, smoke density, etc.) standards. The leather must be treated during tanning in order to meet these requirements. Such leathers are also used for helicopters.
To save fuel, aircraft leather is made extra light (light weight).
Typical aircraft leather.
Leather in a smaller plane.
Trains with leather seats
The railway companies also equip some trains with leather covers.
Leather in the first class of an express train.