With today’s order of 20 Embraer 195s, placed by Tianjin Airlines, the gap in production of the current generation aircraft moving to the new E2 aircraft is becoming de minimis.  According to mba’s calculations, the gap consisted of approximately 50 aircraft, or two quarters worth of production.  The Tianjin order decreases the gap to only 30 aircraft, or slightly more than three months.  A slightly slower delivery schedule will negate the problem, especially since the planned 25 aircraft per quarter delivery schedule announced by Embraer is slightly above their most recent quarterly output.