I’m curious what additional international adds we’ll see in BOS...
I won't assume that intl adds from BOS will be TATL. They cover the obvious spots given fleet (and fleet on order). I don't see them copying the 2000s strategy of CO from EWR and trying tertiary airports from BOS. (BOS-BRS! hah hah). Some established BOS-TATL routes are too thin for two carriers. Mexico and Caribbean are my guesses; longshot BOS-MXP.
Agreed, even with a "hublet" trying to fill a bank of TATL destinations wouldn't work. Lets see if BOS-EDI even works! I would say BOS-ATH is a better longshot too (largest unserved European market from BOS but also one of the longest and low yielding ones) but I think DY could add it for 2020. They could always run BOS-MAN with 757 instead of VS doing it too.
For Caribbean increasing BOS-AUA and adding BOS-SXM are the most likely. I think they stay away from other Dominican destinations since B6 has those on lock. I personally think any leisure destination in the Caribbean/Central America/Bahamas would work with a seasonal weekly from BOS: ANU, GND, BON, BZE, RTB, SJO, GGT.
For Mexico, it would be great to see DL try a Mexican leisure destination that isn't CUN: SJD, PVR or CZM. Even in 2011 the passenger counts were there for a seasonal weekly. Mexico isn't a big VFR market for Greater Boston so scrap GDL, MTY etc. B6 had a 55% LF in their first full month of BOS-MEX but that was with AM flying as well. Maybe DL tries to knock them out - Can an A220 fly BOS-MEX?
Airlines flown: A3, AA, AC, AF, AM, BA, B6, CA, CO, CX, DL, EA, EL, IB, LH, MI, MQ, NH, NW, NZ, OU, PE, QF, S4, SQ, TP, UA, US, VS, WE, WN
2019: CX BOS-HKG, WE HKG-HKT, CA HKT-PEK-EWR, B6 EWR-BOS