Facebook has PTR records for its IP addresses, ending with the #IATA airport code. For instance 31.13.94.35 returns edge-star-mini-shv-01-eze1.facebook.com with EZE = Buenos Aires.

Except that 157.240.1.35 returned (it is now deleted) edge-star-mini-shv-01-lht6.facebook.com. There is no code LHT. Which airport can it be (probably in South America)?

Ping @jpmens @severo_bo