EOS October '05 Load Factor - 19%
The CAA have published their Airport Stats for October 2005, which show 255 scheduled passengers to and from STN on the JFK route.
I understand EOS launched their scheduled service on 18th October 2005 with a 48-seat aircraft, which makes a total capacity of 1,344 seats on the route to and from STN over the 14 day period.
That gives an initial load factor for the first two weeks ops as 18.97% (9 passengers per flight on average).
Assuming my calculations are correct, I hope it has improved since then!