1. The challenges of aircraft noise monitoring for air transport

1.1 Acceptability of air transport

Transporting goods and people is in the general interest. However, each mode of transport has its own specific performance and externalities, so that optimizing the general interest requires an appropriate allocation. For example, in earlier centuries, intercontinental transport was by sea; today, this is only appropriate for heavy goods, starting with oil. For people and light goods, air transport offers incomparable advantages in terms of lead times, and therefore from an economic point of view.