信如下：
Your Visit Pass (short term) which is issued on 20/01/2018 and valid till has been extended on the same condition to 19/04/2018 under Regulation 12(6) of Immigration Regulations.

Your application for Visit Pass (long term) is approved in principle (pending payment). Please make payment before this In-Principle Approval expires; otherwise your application will be treated as withdrawn. Please clickhereto make the payment for your application.
　
原来的LTVP，1月底要过期了，收到了renew LTVP的approved in principle批准信，里面说有一个短期签证延期到4月
家里人要2月中才来新加坡，请问坐飞机时候（单程票），只需要出示这个AIP的信么？还是需要再单独再办理一个入境签证么？
关键这个到4月的短期签证没有正式信，只是在邮件里提到的，我怕在国内的时候，航空公司不放行
到了新加坡入关应该还好
　
有人有类似经验么？