Dokman, you're over complicating a simple concept. Cash flow is either cash or equivalents coming in or cash or equivalents going out. Net cash flow is cash in minus cash out, period. It has nothing to do with assets behind the scenes. As EX396 has stated it, you can be quite wealthy with assets but have negative net cash flow, or your can be asset light with positive net cash flow. Yellow was cash poor, i.e., they lacked sufficient cash on hand (liquidity) to pay their current obligations. They did however have sizeable wealth tied up in real estate, equipment, etc. as we're seeing in the BK.