A flow from a household to firm means that the household (consumer, individual, or however you prefer to call it) transfers wealth (money, input, or product) to the firm (business, company, factory).
A) If Tim buys a plane ticket to Hawaii, he is transferring money to a company, the airline. This represents a flow from a household (Tim) to a firm (the airline).
B) I assume Little Havana is a company, perhaps a restaurant or hotel. If Tim works for this company and earns a wage, so he is providing an input, labor. This represents a flow to the firm. However, the $500 Tim earns is a flow from the firm (Little Havana) to the household (Tim), not the other way around.
Therefore, A is an example, B is not.