PTA is a Production Engineering tool when we produce inflow relationships: AOF, LIT, and IPR curves for production operations. Gas Absolute Open Flow (AOF) curves help size separation and compression facilities and set wellhead operating pressures. Laminar-Inertial-Turbulence (LIT) curves help identify and thus quantify wellbore skin-due-to-turbulence in high deliverability gas wells (vs. physical skin damage). Multi-Point (LIT) tests are critical for high deliverability sour gas blowout calculations and AER (government) submissions. Oil well Inflow Performance Relationship (IPR) curves help size pumping equipment and monitor performance.