Hans Rancke said:That's because most of the material is aimed at supporting the adventures of the typical player character. Very few campaigns deal with characters employed by megacorporations and sector-wide lines or even subsector-wide and interface lines. A couple of subsector-wide lines have been mentioned (Oberlindes, Akerut), and they do have ships in the 1000-5000T range. Larger ships have been mentioned in throwaway references, though I can't recall any of them off-hand.
Hans
Actually, the reason is because most worlds wouldn't support such a presence. Under the UWP gen rules, most planets have a pop of only 5. This wouldn't support a market where huge carriers would be needed. Also, under cargo/parsec rules, most trade in goods doesn't go further than 2 parsecs. So, small cargo ships & subbies would be the rule rather than the exception...