Network's F100 replacement plan was probably QQ's E190s, but with that project delayed by the ACCC, they will keep them on as long as they can get the parts to support them - and indications are that there are real limits particularly in supporting the Tays if they need work. Until then, little choice but to keep the F100s going until QQ comes inhouse. The A319s may replace some F100s, but any frames it releases will be chopped up to keep the others going, just as VARA have done.