1933 Cape Juby-Pernambuco (Brazil). Graf Zeppelin via Barcelona to Pernambuco, but being transported by ship mail to South America since the entire couldn't reach the airship in time. On reverse 9 different transit and arrival marks reveal that when the letter couldn't to be transported on the 3rd Zeppelin Trip, it was hold back to meet the 4th Trip, but it was also sent too late.
1939 Cape Juby-Tetuán.
1947 Cape Juby-Jaen.