Assertion: air transportation | /r/HasProperty | free
Facets:
value: from physical barriers
type: OTHER
Source sentences:
text: Air transport is free from physical barriers like river, mountains and valleys etc.
text: Air transport is free from physical barriers because it follows the shortest and direct routes where seas, mountains and forests do not obstruct.
text: Free from physical barriers: Air transport is free from physical barriers like river, mountains and valleys etc.