Please note that there is an EU-wide restriction on taking liquids in carry-on luggage for all passenger security checkpoints (including CT scanners):
Only liquids in containers no larger than 100 milliliters may be taken, and these must be placed inside a re-closable bag with a maximum capacity of 1 liter. -> More information
Restrictions on regional rail transport
From May 3 to 22, there will be severe disruptions to regional rail services between Mainz and Frankfurt, some of which will also affect access to Frankfurt Airport. Restrictions and replacement services have been incorporated into the timetable and can be found on the DB website or the DB Navigator app.