The initial Domestic 747's, called SR
's, entered service around 1973, the Boeing SR
demonstrator even had '747 Super Airbus' painted on the side in 1972, (won't see that again).
-100 differed from the standard 747's by having strengthened fin attachments, crown splices over the centre body undercarriage supports, stabilizer roots, fin roots, wing lower surfaces, wing/body splice, in-spar ribs, spoilers, ailerons and trailing edge flap supports.
A well as upgraded middle and rear spars, leading edge and nacelle support structures.
Original config was 498, later 523-528 pax.
The later 747-300SR's for JAL held up to 645.
The original 747-100SR's had de-rated JT9D-7's of 43500lbs.
Later, ANA ordered it'sown variants, called 747SR-100B, then JAL had 3 similar ones but called them 747-100B(SR).
The ANA examples had 46500lbs CF-645A engines.
Then JAL ordered 2 -300 versions, but called them 747-100B(SR/SUD), these had 54,000lbs JT9D-7RG2 engines.
From 1991, 747-400D versions appeared, for JAL and ANA, though hoped for sales to India and US domestic carriers never happened.
The JAL 747 lost 20 years ago was a SR
, the third built, after a botched repair carried out by Boeing after a 1978 tail strike failed.
Take a good look at those pax capacities of this interesting 747 variant, before wondering (again) if airports can handle A380s!