Visa 100是配偶移民中的永久签证，你朋友是不是跟有澳洲身份的人（公民或者PR），结婚五年以上有小孩？问题一，这种情况下申请配偶移民会直接得到PR身份。问题二，单程当然可以上飞机，因为这个签证是澳洲的永居。Partner Temporary Visa (Subclass 309) and Permanent Visa (Subclass 100)For people from overseas to enter and stay in Australia with their partner, who must be an Australian citizen, Australian permanent resident or eligible New Zealand citizen. If two years after you apply the relationship is ongoing, a permanent visa may be granted.http://www.immi.gov.au/migrants/family/family-visas-partner.htm
