I was looking at ifr low enroute chart and just figured out that KSEA and KLAX are depicted as class D. Aren't they Class B airports? why do they have D mark?
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8$\begingroup$ Does this answer your question? When is this Class D airspace not Class D airspace? and see also: Why does Class D overlap class B around SeaTac? $\endgroup$ – randomhead Apr 27 at 13:26
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$\begingroup$ Related: aviation.stackexchange.com/questions/8790/… , aviation.stackexchange.com/questions/50109/… , aviation.stackexchange.com/questions/84200/… . I think you'll find your answers there-- (Whoops, guess I hadn't refreshed my window, didn't realize a similar comment was already posted.) $\endgroup$ – quiet flyer Apr 27 at 14:41
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2$\begingroup$ Since you're referring to Low Enroute IFR charts, I think you need to show what you mean. Those charts don't use the same symbology as VFR charts. $\endgroup$ – ymb1 Apr 27 at 16:06
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2$\begingroup$ This question appears to be a duplicate of the questions linked above, except for the fact that it specifically addresses the low-altitude IFR enroute charts rather than the VFR sectional charts. Perhaps that's enough to justify a new question? I'll likely be voting to re-open, if the question gets closed. $\endgroup$ – quiet flyer Apr 28 at 15:47
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Your question is interesting but the answer is not fully obvious without a bit of research. In looking at the KSEA IFR Enroute chart (L01 IFR enroute chart -third image below) it does indeed show that a portion of the the Seattle International Airport is within Class D airspace.
The second image below shows an excerpt from FAA Order 7400.11E describing the Class D airspace as it relates to KSEA.
The third image is from the L01 IFR Enroute Chart for Seattle. 
The fourth image below shows part of the legend for an IFR Enroute Low Altitude chart.
So, although some general information relating to the OP's question may be addressed by looking at the link shown above by @randomhead as it applies to LAX, the OP is asking a reasonable question which is fundamentally different (from the question addressed in the link mentioned above) and probably should be left open.
Further, it is a fairly unusual circumstance to have Class D areas attached to the primary airport upon which the Class B airspace is predicated, so a discussion relating to identifying the affected areas that are Class D versus Class B may be very informative.
Likely, the Seattle Class D airspace (dimensions shown above), is to handle go-arounds, (that turn and enter a downwind to return to the airport as opposed to returning to the TRACON to be vectored out for another full [longer] approach), helicopter traffic, traffic watch aircraft, etc. (being on or staying on the Control Tower's frequency, for example) .
If you do the research for KLAX, it's the same principle (but different dimensions for the Class D).
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$\begingroup$ By the way, the question referenced by the second link in randomhead's comment, which is also the first link in my comment, does address the Class D airspace at SeaTac specifically. So it appears the question is a duplicate, except for the fact that it is aimed specifically at the low altitude IFR enroute chart rather than the VFR sectional chart.Some of the information in this answer duplicates the information given in the answer to that question (and to other questions-- some answers to the questions pertaining to LAX also addressed the situation at SeaTac.) $\endgroup$ – quiet flyer Apr 28 at 15:25
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$\begingroup$ @quietflyer - I don't disagree with your comment. But, the specific question asked (regarding the Low Alt IFR Enroute Chart) is not addressed by the info in the links above. So, I think in totality an answer that addresses the specific question asked will ( to be fully understandable and in reasonable context) overlap some info/answers in previous questions. Since ASE is meant to help people understand various aviation related issues, excluding good questions because they may be similar to other questions is denying the opportunity for a broader understanding of complex issues. $\endgroup$ – 757toga Apr 28 at 15:43
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