在携程上订的波罗的海航班，订票时提醒如下：
乘坐波罗地海联合航空航班的旅客，需在出行前5天内至航司官网提前办理值机并打印登机牌https://www.airbaltic.com/en/check-in
否则机场柜台将收取30EUR/人的值机费用。
然后在到了5天的时间，登陆官网进行值机登记，输入订票号和姓名后出现：
Check-in is not opened yet!
Passengers, who have reserved seats for their
Bookings can check-in for the flight 5 days before the scheduled departure. Rest of the passengers are welcomed to check-in for the flight 36 hours before departure.
If you wish to check-in for your flight now, add seat to your
Booking and proceed!
如此看来，波罗的海航空是廉价航空，选座和行礼、餐食、快速通道等等，都是要另外付费购买的。
但是看提示好像36小时会开通值机通道，难道那时值机会免费？而行李额，每人只有随身8公斤。
https://bbs.qyer.com/thread-3059328-1.html
見官網說明：https://www.airbaltic.com/en/online-check-in-conditions