Massport has released the numbers for July.
Total airport passengers through July - 18,182,735 (up 4.6% over 2013)
Total domestic passengers through July - 15,302,350 (up 4.0% over 2013)
Total international passengers through July - 2,826,003 (up 8.0% over 2013)
Total passengers for July - 3,137,087 (up 5.8% over 2013)
Total domestic passengers for July - 2,568,869 (up 4.1% over 2013)
Total international passengers for July - 559,310 (up 14.2% over 2013)
Average load to Asia - 175 passengers (JAL and Hainan)
Average load to Middle East - 231 passengers (Emirates and Turkish)
Cope average load - 110 passengers (I think their best month from a load perspective)
Average load to Europe - 218 passengers
My math could be off, but I think JAL and Hainan combined had a load factor of 88% for the month.
There's no reason why Logan should not top 31 million passengers this year.