The Other $1.3 Billion?
John Kerry, along with Jake Sullivan and others, made about five secret trips to Iran in 2013:
https://www.reuters.com/article/us-iran-nuclear-bilateral/u-s-iran-held-secret-talks-on-march-to-nuclear-deal-idUSBRE9AN0FB20131124
At least $1 billion in cash entered Iran by the time this article was written in February 2014:
https://www.reuters.com/article/us-iran-dollars-exclusive/exclusive-iran-smuggles-in-1-billion-of-bank-notes-to-skirt-sanctions-sources-idUSKBN0LS1LV20150224
So with the $400 million flown in from Geneva in 2016 (two planes?), we have four routes:
Turkey, UAE, Iraq, and Switzerland
…and five planes, if there were two from Geneva and one each to Iraq, Dubai, and Turkey.
If memory serves me, the flights from Geneva left around April 16, 2016. So it's just a matter of finding the others.
John McCain made his Syria visit via Turkey around that time…and Kerry made several visits to the Middle East as well…