747 v 744
Well let me just first say that I am a 747 pilot and the allocation of 744 slot are out of my grasp and any opinnion I present is either hearsay or a probable misrepresentation or I am twisting the truth.
Some of the 744 FO's where hired from people that worked in the operations department with minimum hours. Some where experience 744 people from other companies. Some where Icelandic Union members.
Should you join the 747 fleet, yes there could be a chance to move to the 744 later on. Supply and demand you see. If there are more airplanes coming and a need for more pilots on 744 and no rated people on the market.
The base assignement for the 744 contract is probably similar to 747. JED or LUX or what base the company has at given type for that fleet and where people are needed.