2 0 ▁▁ ▁About ▁ 1 4 1 0 : ▁The ▁first ▁known ▁mention ▁of ▁a ▁semi - r ural ▁l ane ▁called ▁He ath row ▁( sp elled ▁La ▁H eth ere we ). ▁He ath row ▁divided ▁far ml and ▁and ▁he ath ▁until ▁ 1 8 1 9 ▁when ▁the ▁he ath ▁also ▁became ▁far ml and . ▁Specifically , ▁the ▁l ane ▁divided ▁the ▁ham let ▁of ▁Harm ond sw orth ▁( on ▁the ▁north western ▁edge ▁of ▁today ' s ▁air port ) ▁from ▁the ▁ 1 7 th ▁and ▁ 1 8 th ▁century ▁highway men ' s ▁la ir ▁of ▁H oun slow ▁He ath ▁( center ed ▁roughly ▁where ▁Terminal   3 ▁is ▁today ). ▁A ▁little ▁of ▁Har ling ton , ▁Hat ton ▁in ▁Bed font ▁and ▁Stan well ▁also ▁fall ▁within ▁the ▁air port ' s ▁per imeter ▁road . ▁ 1 9 1 5 : ▁F aire y ▁A viation ▁started ▁assemb ling ▁and ▁flight ▁testing ▁its ▁aircraft ▁from ▁North olt ▁Aer od rome , ▁about ▁six ▁miles ▁north ▁of ▁the ▁modern ▁He ath row ▁air port . ▁▁ 1 9 1 7 - 1 9 1 9 : ▁About ▁ ▁sout heast ▁of ▁He ath row , ▁H oun slow ▁He ath ▁Aer od rome ▁was ▁the ▁only ▁London ▁aer od rome ▁with ▁custom s ▁facilities ▁in ▁ 1 9 1 9 . ▁After ▁the ▁closure ▁of ▁H oun slow ▁He ath ▁Aer od rome ▁in ▁ 1 9 1 9