https://help.boox.com/hc/en-us/community/posts/30850517820436–Cancel-Now-How-long-do-I-have-to-cancel-a-Delta-flight-without-penalty

https://help.boox.com/hc/en-us/community/posts/30850517820436–Cancel-Now-How-long-do-I-have-to-cancel-a-Delta-flight-without-penalty
https://help.boox.com/hc/en-us/community/posts/30850517820436–Cancel-Now-How-long-do-I-have-to-cancel-a-Delta-flight-without-penalty
https://help.boox.com/hc/en-us/community/posts/30850517820436–Cancel-Now-How-long-do-I-have-to-cancel-a-Delta-flight-without-penalty

https://help.boox.com/hc/en-us/community/posts/30850517820436--Cancel-Now-How-long-do-I-have-to-cancel-a-Delta-flight-without-penalty

https://help.boox.com/hc/en-us/community/posts/30850517820436–Cancel-Now-How-long-do-I-have-to-cancel-a-Delta-flight-without-penalty