Originally Posted by Bucking Bar

Please recall we have a scope section. In the case of the E190, it drove an increasing Mainline domestic to DCI block hour ratio which was nearly twice what an E190 could fly. In fact, that ratio for 50 E190's equalled 40 737-900 (because of the 737's higher - fly all night - utilization).

Whether the increasing ratio protected 737 growth, or simply took the surplus out of the current ratio, the effect was to protect more mainline flying.