Token Bird has been inspired into investigative mode (possibly by the fact she has spent much of this rainy non-flying day reading a detective novel)!
After pursuing several fruitless avenues of investigation using the magic of t'internet, Token Bird decided to pop by Excelsis' office (it's on the way home anyway).
Token Bird has discovered that said building is vacant! No blinds, no furniture. However, some letters were just inside the doorway, the address of the top one visible. It was addressed to Jim Knight at Excelsis Airways. Possibly a job application from a naive hopeful.
Token Bird has been unsuccessful so far in discovering more details of this mysterious 'Jim Knight'.