Assertion: scheduled air transportation | /r/HasProperty | introduced
Facets:
Source sentences:
text: When scheduled air transportation was first introduced, mail was among the first passengers to utilize this service.
text: These services can be put into different categories, such as:When scheduled air transportation was first introduced, mail was among the first passengers to utilize this service.
text: When scheduled air transportation was first introduced, mail was among the first passengers to utilize this service.