Former President Donald Trump took a swipe at First Lady Jill Biden during his 78th birthday celebration in West Palm Beach on Friday, in particular complaining about how much she travels. “His wife flew back and forth like it was a taxicab,” said Trump. “It’s Air Force One and/or Air Force Two. I mean, just back and forth, back and forth, let’s go, let’s go, sit in a trial for a day, go back, forth, back forth. It’s really terrible.” Commenters on social media quickly mocked Trump, with many speculating he’s likely just jealous that his own former First Lady, Melania Trump, hasn’t been jettin…