N.Y. Comp. Codes R. & Regs. tit. 21, § 175.12 – Guidelines for meet and greet services at the airport.

(a) All commercial ground transportation operators and companies utilizing ground transportation services may meet and greet individuals or groups in the terminal building only by the use of hand-held signs and only in the baggage claim area.
1. (1) Meet and greet services must be conducted in a manner that does not obstruct the normal flow of pedestrian traffic through the terminal.
  (b) Signs.
2. (1) Signs may not exceed 15″ by 15″, or be less than 8.5″ by 11″.
3. (2) The sign must have the name of the individual, group or company being met. The name/logo of the commercial ground transportation company, tour operator, etc., must be on the sign, not exceeding 25 percent of the sign. The sign must be of professional quality.
(c) Individuals conducting meet and greet services may be required, from time to time, to provide the SRAA certain pertinent information about the individual or group being met (passenger’s name, flight number, arrival time, etc.) at the request of any airport law enforcement personnel, any State or local law enforcement officer, all airport officials, and all agents appointed by the SRAA who display proper identification.
(d) Under no circumstances shall the individual conducting meet and greet services at the airport solicit additional passengers.
(e) Individuals conducting meet and greet services who are in violation of these guidelines will be required to discontinue their services immediately.