I have the Case Cruiser version of the Pelican 1514 so I can fit my 17" MacBook Pro in the lid and still carry the camera and laptop onto a plane. I haven't flown with it yet, so I'm not sure it will fit under the seat, but it will fit in the overhead bin.
I borrowed the two 50mm lenses that are in this picture. And there is a macro extension tube under the flash that you don't see. Also missing is the white power cord for the laptop. The 85mm has it's lens hood on and is inbetween the 300+1.4 and the flash. I am a little concerned about fitting in a potential 17mm TS-E + 50mm 1.2 + the WFT unit so I can get GPS coordinates automatically... I had not planned on putting my camera into this case, the tripod was supposed to fit in this one, but it seems to have worked out well in the end. The tripod I have just would not fit.
This is my Pelican 1450 case with almost the same gear. I won't be able to fit a 17mm TS-E or 50mm 1.2 in here, but it has served me very well, and is what I would take if I don't need my computer. It is hard to see, but there are pockets in the fabric covering of the 1/2" foam in the lid. This case has fallen three feet out of the back of a truck onto the pavement and nothing inside was damaged. I have to thank my Mom for helping me with the sewing (I did some of it too). The pick & pluck foam breaks apart after taking stuff out a lot of times and is hard to clean if it gets dusty. I usually store the lens cloth in-between the camera and flash since there is very little room.