Ahoy me hearties!
Was sitting on my lonely isle,
When I did hear a sound come near,
‘Twas skyship! - come four hundred mile,
Wombat! Rescued! Aft’ four year!
Your humble and obedient servant,
The ghost of Alexander Selkirk, born 1676, died Dec. 12, 1721 at sea.
WELL DONE WOMBAT! 
The backstory:
The clues are written in the voice of Alexander Selkirk, a Scottish castaway who lived for four years on a Pacific island called “Más a Tierra” (now part of Chile) which was renamed Robinson Crusoe Island in 1966. There is also a smaller island 93 NM to the west of Robinson Crusoe Island named after him: Isla Alexjandro Selkirk, though this has no airport. The airport in my pic is clearly shown in the original, but the compression performed when uploading has blurred it a lot.
Alexander joined a band of buccaneers in the Pacific and by 1703 was sailing master of a galley on a privateering expedition. These privateers would try to capture Spanish galleons bringing gold & especially silver north from the mines of South America to the Pacific port of Panama (clue #1).
In my reply to Parorng and Wombat, the key line & word was “Away from me in isolation”, as Selkirk was alone on the island from September 1704 until February 1709. Wanchaibanzai was on the right track, but, alas, ended up in the Indian Ocean!
The next clues can be solved thus:
If I couldst call a saintly man, → One of the saints, in this case, Saint James
Within his airy Center placed, → airy Center (note the capital “C” - A clue! = ATC center
Saint James + ATC = Santiago ATC. Santiago means “Saint James”, derived from Spanish santo “saint” combined with Yago, an old Spanish form of James, the patron saint of Spain.
He would create a Peaceful plan → Note the capital “P” - another clue! Peaceful = Pacific. That’s where you should be looking!
To rescue me from isle, with haste!
…
I have heard sailors of the blue
Speak of desert dromedarys - true! → Camels
If fleets of these could fly to me → fleet of camels = a caravan. Flying caravan = Cessna caravan
In two hours, late they wouldest be!
