Orion was a new airline operating charter flights for the Horizon Group.  Their 737s were regular at BHX flying to the usual sunspot destinations in the early 1980's.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/130275500@N02/16134606285/">Orion B737-200 G-BHVH at BHX</a>