took delivery of the first L1011´s in 1973 (which were of course all series 1) they got the standard, without center bins cabin layout, as all other carriers did also.
This layout also featured the above mentioned small, square-shaped overhead bins, which were typical TriStar and made it look so special.
(With them installed someone could tell at the very first glimpse it was a TriStar)!!!
Also mentioned above, they got some second hand TriStars.
In 1979 however, DL
took delivery of the first L1011-500 series, the shortened fuselage longhaul version of the TriStar.
At that point Lockheed already offered the center bins on the L1011 as an option left up to the airlines.
´s original 5 factory-delivered L1011-500 were all equipped with the center bins, as were all PA´s 500 from where DL
´s second hand L1011-500 came in the mid 80´s (after very shortly flying for UA
Also at this point in the mid 80´s DL
started to convert 7 of its L1011-1 into L1011-250 longhaul series to acompany the 500 on international flights, as DL
dramatically expanded its international route network!
These L1011-250 were also refitted with the center bins.
Then later, as carry-on items got bigger and the first (today so famous) carry-on trolleys came into fashion, most (if not all???) of DL
´s L1011´s were refitted with the bigger and longer side bins.
´s L1011-500 and 250 flying international were later all retrofitted to 90´s standard cabins. Just by the look you definetley couldn´t tell that you were on an up to 20+ year old aircraft. They looked brand-new, while the L1011-1´s flying domestically except for the bins and seat covers still had their originally 70´s interior with the brown and orange bulkheads and panels etc.
The first picture shown above is that of an L1011-1, the second that of an L1011-250 with retrofitted international style cabin.
Hope this helps.