In the first three months of 2018, nearly every second planned migrant deportation was aborted, the Funke Mediengruppe reported on Thursday.
5,548 rejected asylum seekers were deported in the first quarter of the year, the report states with reference to the federal police.
During the same period, the authorities had to abort 4,752 repatriations in advance, for example due to the migrant in question not being found.
In 75 cases pilots or their respective airlines refused to let asylum seekers on board, according to the report. A total of 314 deportations were stopped for this reason in 2017 and 139 cases in 2016.