Originally Posted by
callmedave
I've got 73A and 734 operating my LGW-ALC return this weekend, so presumably there's a further differentiation between 737-400s as well?
Flights a long way out will typically show the normal aircraft identifier (734, 744, etc) and then a few days before it will change to the specific configuration (73A, 74C, 74G, etc).
You will likely see your inbound change to 73A between now and OLCI.