Everything is fully constrained here. Continuity of those curves and surfaces are g1 or g2, only few of them are made intentionally with g0 continuity. 
Here you can look at zebra analysis of the my surfaces:​​​​​​​
https://academy.3ds.com/en/projects/surface-model-supersonic-fighter-jet​​​​​​​
https://www.facebook.com/3DSAcademy/?sk=app_128452718493646&_rdc=2&_rdr#_=_

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