The first large (above 100 seats) passenger jet landed on 18 April 2016, a Boeing 737-800 operated by Comair. It was an implementation flight to test the route, ground operations and handling, ahead of commencement of scheduled services. The landing was not straightforward, with the aircraft only successfully landing on its third approach (the first approach was a planned Go-around, because of the lack of experience with this airport). On 26 April 2016, a further delay to the opening, without a specified end date, was announced by the St. Helena Government because of concerns regarding wind shear, after the problematic landing by the Comair 737-800 intended for regular flights. Only southbound landings (runway 20) have wind shear problems, not northbound. There is a need to define measurement methods for the wind shear in order to understand when landing can be done, and when to cancel flights. The late postponement caused extra cost, for example contracted employees and contracted airlines that cannot operate, hotels that were built, and also the need to extend the use of the RMS "St Helena", which originally was due to be retired after the airport opened.