An evening pause: This short video shows us what it is like for the pilot and co-pilot as they prepare for departure from Frankfurt, Germany, on a cargo flight to Africa and beyond. Note that even though the crew is German and the airport is German, all communications with the control tower are in English. Note also that their altitude is recorded in feet, not meters. The American big lead in the commercial airline industry in the first half of the 20th century allowed it to set the standards, including the use of feet and English in these matters.
Hat tip Tom Biggar.