On 31 May 1978, Sikorsky S-61N s/n 61.808 was registered LN-OQN in Norway with K/S Helikopter Service A/S, Oslo.
On 3 April 1986, the 1978-built Sikorsky S-61N was registered PH-NZR in the Netherlands with KLM NV, operated by
KLM Helikopters BV. The PH-NZR was mainly used on offshore flights first out of Amsterdam Airport Schiphol, later
out of Den Helder-De Kooy. In 1991, Rowan Companies Inc., owner of ERA Aviation Inc., bought 49% shares of KLM
Helikopters BV and the company was renamed KLM ERA Helicopters BV. On 12 October 1993, the PH-NZR was registered
with KLM ERA Helicopters. Between mid 1994 and mid 1995, the PH-NZR participated as part of the United Nations
peacekeeping force as UN191 in Croatia as replacement of the damaged Sikorsky S-61N PH-NZD. In 1997, Schreiner
Luchtvaart Groep BV bought the 51% shares of KLM in KLM ERA Helicopters BV. On 30 January 1998, Rowan Companies Inc.,
announced that it had terminated its 49% interest in KLM ERA Helicopters and sold to Schreiner Luchtvaart Groep BV.
As payment for their shares in KLM/ERA Helicopters BV, Rowan Companies Inc. received a distribution of assets
consisting of cash, two Sikorsky S-61N helicopters, including the PH-NZR, spare engines and parts. The equipment
would be utilized by the Company's subsidiary, Era Aviation, Inc. As a result of this transaction, the PH-NZR was
registered to Rowan Drilling Aviation (Netherlands) BV, on 11 February 1998. The same day, registration PH-NZR was
cancelled and on 12 February 1998, the helicopter was temporary registered N563EH in the USA. On 18 February
1998, the helicopter was registered as N563EH with ERA Aviation Inc., Anchorage, AK, USA. Since, the registered owner changed to
ERA Helicopters LLC, Lake Charles, LA. On 15 December 2008, registration N563EH was cancelled as exported to Brazil. The Sikorsky
S-61N2 was registered PR-AEL in Brazil with Aeroleo Taxi Aereo Ltd., Rio de Janeiro, as operator and ERA Helicopters LLC as owner.
On 5 November 2011, registration PR-AEL was cancelled. On 17 March 2014, Sikorsky S-61N c/n 61808 was registered N619CK in the USA
with Croman Corp., White City, Oregon. On 8 September 1990, Sikorsky S-61N PH-NZR was seen in Emmen, the Netherlands. That day, King
Gustav of Sweden was one of the guests at the opening of the new plant and research centre of Ericsson Radio Systems in Emmen.
The guests were flown in by KLM Helikopters with two Sikorsky S-61N: PH-NZI #1 and PH-NZR #2. The helicopters landed in a meadow
opposite the Ericsson facilities.