Still just typing years after the fact of the invoice. No physical evidence like an invoice with RA, ram air, right on it. The invoices are the foundation of any research. The 'Big Bang' so to speak. Everything else takes it's cues from the invoice. The invoice has the 'Biggest Voice'. It's not a 'speculation'. Everything after the invoice is just speculation based on an invoice. In this case there's no need for speculation because ram air is spelled out for you 'RA'.