Fans identify the episode where Kramer bets on plane arrival times at an airport as "The Diplomat's Club," and discuss other plot threads including Jerry's airport club visit and his girlfriend.
http://www.geocities.com/tnguym/Seinfeld_2s.html "After his quick trip to Ithaca, Jerry plans to meet a super model at an airport club, but his assistant, Katie, makes the trip a nightmare. Elaine says she will quit working for Mr. Pitt, but finds out that she's going to be in his will. She becomes a suspect when he overdoses his medication. George tries to prove to his boss that he is not a racist, when he says his boss looks like "Sugar" Ray Leonard. To prove it, he tries to find anyone who's black that will be his friend. While at the airport club, Kramer meets a rich Texan with whom he starts making bets. Kramer hasn't gambled in three years and when he begins to lose, he calls in Newman for reinforcement."
I would have been hasty and said it was The Pilot, but you're right, it's The Diplomat's Club. 'The Pilot' has nothing to do with the pilot that wouldn't take Jerry on his plane in 'The Diplomat's Club'.
That one is called "The Diplomat's Club." It's also where Jerry is meeting his girlfriend at the club and he's thrown off the plane so he has to drive back from Ithaca.