Official CAA Statistics show the following PAX numbers on the STN-JFK route (arrivals and departures at STN):
Nov 2005: 2,201
Dec 2005: 2,563
Jan 2006: 2,726
Feb 2006: 2,681 *
* Provisional
With a daily flight by each carrier there is capacity for 300 inbound and outbound passengers per day (2 x 102 + 2 x 48), which equates to about 36,000 available seats over the period shown above, therefore average load is about 28% across the two carriers.
Unfortunately it is not possible to split the EOS/MAX traffic, which would prove more interesting.
The MAXjet CEO was recently quoted in a magazine article boasting initial load factors of 50%, but if the above figures and calcuation are right even if all the passengers flew on MAXjet they still wouldn't be anywhere near 50% loads.