The Australian Competition and Consumer Commission (ACCC) is set to closely monitor domestic airfares following the voluntary administration of Regional Express (Rex). This development has led to concerns about increased airfares on domestic routes, particularly those connecting major cities. The ACCC has expressed its intention to maintain vigilance over the pricing strategies of major airlines such as Qantas and Virgin Australia. This comes in the wake of Rex's decision to cease servicing key routes, which could potentially lead to reduced competition and higher prices for consumers.