Watch out when flying Delta. I was flying back from Europe.  My flight from Greece to Germany was late.  I arrived at my gate in Germany 35 mins before departure.  I was told too bad you had to be at the gate 45 mins prior to departure.  It didn't matter that my connecting flight was late. 

 I had to wait until the next flight (the next day!), PAY a 185€ change of ticket fee, pay my own hotel and meals!

 They said they were sorry but if the didn't charge me how could they charge someone who missed their flight on purpose.

 Watch out for Delta!