On XXXX XXXX, 2015, I was traveling with my wife on XXXX XXXX Flight number XXXX from XXXX to XXXX. The pilot came on the speaker at approximately XXXX CDT and announced that if we applied for an XXXX XXXX Advantage Card, we would receive a sign up bonus of XXXX frequent flyer miles and if we turned the application back into the flight attendant while on board we would receive an additional XXXX frequent flyer miles. Both my wife and I applied and turned our applications into the flight attendant. When the flight attendant brought us the application and we saw it only mentioned XXXX miles in the application, we questioned her to make sure we understood that if we applied, met the other qualifications ( spend {$3000.00} within 90 days ) and were approved and it occurred while on board, we would received a total of XXXX frequent flyer miles. The flight attendant assured us that this was correct. Also the application noted our flight number ( XXXX ) next to our signatures. 
We were both approved and when the literature arrived, describing the card and its benefits, it did not mention any supplemental benefit, i.e., the additional XXXX miles. I immediately called Citibank and spoke to a representative and gave him all of the details. I received a letter on Friday XX/XX/XXXX that said they had investigated my complaint and they advised they could not approve the additional miles. I have covered my damages by buying XXXX miles for {$860.00} today. I observed several other passengers apply the same time I did, so there may as many as XXXX-XXXX other parties affected. They would be easy to find as the application date would be XX/XX/XXXX, XX/XX/XXXX or at most the XX/XX/XXXX. 
