It was viable until PEEL asked the former head of cargo to cancel flights.. There was a mass influx of 747 charters pretty much daily (GTI and CKS) planned up until February this year which 'I believe' was cancelled by PEEL, the move during the pandemic of all the PPE charters to LPL was 'I believe' also PEEL's doing in an attempt to start making it look unviable with various excuses given to airlines like "no staff, no warehousing, can't handle more then one at once etc"
Haven't Amazon already operated from the airport - the French 737? The rest of the stuff is all ad hoc, which is by its nature here today and gone tomorrow, not really the basis for long term investment.