The airlines exchange messages all the time - millions of them. When the US started the process of demanding passenger lists so that they could authroise the aircraft to depart the airlines knuckled down and met the requirement.
Look at it the other way - you need to define how the data is going to be formatted in the passport chip. Then you have to get it loaded - you don't want people able to add it themselves. But, you'll find that the whole point of the chip is that it is read only. If you made it possible to add things after creation the potential for fraud would be enormous. If it was possible to add things to the passport chip surely visas would be added but Im not aware that happens.
This is the specification
https://www.icao.int/publications/Do...p9_cons_en.pdf and you need section 5.3 which says:
"This edition of Doc 9303 is based on the assumption that eMRTDs will not be written to after personalization. Therefore the personalization process SHOULDlock the contactless IC as a final step. Once the contactless IC has been locked (after personalization and before issuance) no further data can be written to, modified or deleted from the contactless IC. After issuance a locked contactless IC cannot be unlocked."