4
Great question. The short answer to your question is "Full Time." Ultimately that Class D airspace will be incorporated into the LAX Class B, but there is a lot of red tape involved so step one was to add the Class D extensions, then it will be incorpoated into LAX Class B at a later date. Its a big deal, Title 14 CFR Part 71 had to be amended, ...
2
B19 is close to the Portland class C airspace, which starts at 1500 MSL, so a TPA of 995 MSL provides 500ft of vertical separation.
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